87 (number)
Encyclopedia
87 is the natural number
following 86
and preceding 88
.
and the eighth of the form (3.q). The aliquot sum of 87 is 33 within the aliquot sequence (87,33,15,9,4,3,1,0) 86 being the eighteenth composite number in the 3-aliquot tree.
Eighty-seven is the sum of the squares of the first four primes. It is also the sum of the sum of divisors of the first ten integers.
Natural number
In mathematics, the natural numbers are the ordinary whole numbers used for counting and ordering . These purposes are related to the linguistic notions of cardinal and ordinal numbers, respectively...
following 86
86 (number)
86 is the natural number following 85 and preceding 87.-In mathematics:86 is the 25th distinct semiprime and the 13th of the form...
and preceding 88
88 (number)
88 is the natural number following 87 and preceding 89.- In mathematics :Eighty-Eight is a refactorable number, a primitive semiperfect number and an untouchable number...
.
In mathematics
Eighty-seven is the twenty-sixth distinct semiprimeSemiprime
In mathematics, a semiprime is a natural number that is the product of two prime numbers. The first few semiprimes are 4, 6, 9, 10, 14, 15, 21, 22, 25, 26, ... ....
and the eighth of the form (3.q). The aliquot sum of 87 is 33 within the aliquot sequence (87,33,15,9,4,3,1,0) 86 being the eighteenth composite number in the 3-aliquot tree.
Eighty-seven is the sum of the squares of the first four primes. It is also the sum of the sum of divisors of the first ten integers.
In sports
- In cricketCricketCricket is a bat-and-ball game played between two teams of 11 players on an oval-shaped field, at the centre of which is a rectangular 22-yard long pitch. One team bats, trying to score as many runs as possible while the other team bowls and fields, trying to dismiss the batsmen and thus limit the...
in Australia, 87 is considered an unlucky score (the devil's number) thought to originate from the fact that 87 is 1313 (number)13 is the natural number after 12 and before 14. It is the smallest number with eight letters in its name spelled out in English. It is also the first of the teens – the numbers 13 through 19 – the ages of teenagers....
runs short of a century, equivalent a Nelson's, Double-Nelson's etc. (111111 (number)111 is the natural number following 110 and preceding 112. It is the lowest positive integer requiring six syllables to name in American English, or seven syllables in Canadian and British English...
, 222 etc.) in English cricket. - In the National Hockey LeagueNational Hockey LeagueThe National Hockey League is an unincorporated not-for-profit association which operates a major professional ice hockey league of 30 franchised member clubs, of which 7 are currently located in Canada and 23 in the United States...
, Wayne GretzkyWayne GretzkyWayne Douglas Gretzky, CC is a Canadian former professional ice hockey player and former head coach. Nicknamed "The Great One", he is generally regarded as the best player in the history of the National Hockey League , and has been called "the greatest hockey player ever" by many sportswriters,...
scored a league-high 87 goals with the Edmonton OilersEdmonton OilersThe Edmonton Oilers are a professional ice hockey team based in Edmonton, Alberta, Canada. They are members of the Northwest Division in the Western Conference of the National Hockey League ....
in the 1983–84 NHL season.
In other fields
Eighty-seven is also:- The year AD 8787Year 87 was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Saturninus...
, 87 BC87 BCYear 87 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Octavius and Cinna/Merula...
, or 1987 - The atomic numberAtomic numberIn chemistry and physics, the atomic number is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus. It is conventionally represented by the symbol Z. The atomic number uniquely identifies a chemical element...
of franciumFranciumFrancium is a chemical element with symbol Fr and atomic number 87. It was formerly known as eka-caesium and actinium K.Actually the least unstable isotope, francium-223 It has the lowest electronegativity of all known elements, and is the second rarest naturally occurring element... - The number of years between the signing of the U.S. Declaration of Independence and the Battle of GettysburgBattle of GettysburgThe Battle of Gettysburg , was fought July 1–3, 1863, in and around the town of Gettysburg, Pennsylvania. The battle with the largest number of casualties in the American Civil War, it is often described as the war's turning point. Union Maj. Gen. George Gordon Meade's Army of the Potomac...
, immortalized in Abraham LincolnAbraham LincolnAbraham Lincoln was the 16th President of the United States, serving from March 1861 until his assassination in April 1865. He successfully led his country through a great constitutional, military and moral crisis – the American Civil War – preserving the Union, while ending slavery, and...
's Gettysburg AddressGettysburg AddressThe Gettysburg Address is a speech by U.S. President Abraham Lincoln and is one of the most well-known speeches in United States history. It was delivered by Lincoln during the American Civil War, on the afternoon of Thursday, November 19, 1863, at the dedication of the Soldiers' National Cemetery...
with the phrase "fourscore and seven years ago..." - The model number of Junkers Ju 87Junkers Ju 87The Junkers Ju 87 or Stuka was a two-man German ground-attack aircraft...
- The number of the French department Haute-VienneHaute-VienneHaute-Vienne is a French department named after the Vienne River. It is one of three departments that together constitute the French region of Limousin.The chief and largest city is Limoges...
- The designation of Interstate 87Interstate 87Interstate 87 is a Interstate Highway located entirely within New York State in the United States of America. I-87 is the longest intrastate Interstate highway in the Interstate Highway System. Its southern end is at the Bronx approaches of the Robert F. Kennedy Bridge in New York City...
, a freeway in New YorkNew YorkNew York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...
; the European route E87 from TulceaTulceaTulcea is a city in Dobrogea, Romania. It is the administrative center of Tulcea county, and has a population of 92,379 as of 2007. One village, Tudor Vladimirescu, is administered by the city.- History :...
to AntalyaAntalyaAntalya is a city on the Mediterranean coast of southwestern Turkey. With a population 1,001,318 as of 2010. It is the eighth most populous city in Turkey and country's biggest international sea resort.- History :... - The code for international direct dial phone calls to InmarsatInmarsatInmarsat plc is a British satellite telecommunications company, offering global, mobile services. It provides telephony and data services to users worldwide, via portable or mobile terminals which communicate to ground stations through eleven geostationary telecommunications satellites...
and other services - The 87 photographic filter blocks visible light allowing only infrared light to pass
- The ISBN Group Identifier for books published in Denmark.
- the opus number of the 24 Preludes and Fugues24 Preludes and Fugues (Shostakovich)The 24 Preludes and Fugues, Op. 87 by Dmitri Shostakovich is a set of 24 piano pieces, one in each of the major and minor keys of the chromatic scale. While the musical style and ideas are Shostakovich's own, it follows the form of Frederic Chopin's Op. 28 preludes.Each piece is in two parts: a...
of Dmitri ShostakovichDmitri ShostakovichDmitri Dmitriyevich Shostakovich was a Soviet Russian composer and one of the most celebrated composers of the 20th century....
. - In model railroading, the ratio of the popular H0 scale is 1:87. Proto:87Proto:87Proto:87 is a model railroad special interest group founded in 1978, dedicated to providing a finescale alternative to traditional H0 scale.Due to manufacturing restrictions and considerations such as durability, ease of operation and price, most model railroad products feature significant...
scale claims to offer precise proportions of wheels and tracks of real railroads. - David BowieDavid BowieDavid Bowie is an English musician, actor, record producer and arranger. A major figure for over four decades in the world of popular music, Bowie is widely regarded as an innovator, particularly for his work in the 1970s...
CD (1987) "Never Let Me DownNever Let Me DownNever Let Me Down is an album by David Bowie, released in April 1987. Written over a 3-month period and recorded in Switzerland, Bowie regarded the album at the time as a "move back to rock 'n roll music...
" includes the song, "'87 and Cry" - The 87th United States Congress87th United States Congress-House of Representatives :-Senate:* President: Richard Nixon , until January 20, 1961** Lyndon Johnson , from January 20, 1961* President pro tempore: Carl Hayden -House of Representatives:...
met from January 3, 1961 - January 3, 1963 during John F. Kennedy's time in office - Ed McBain's "87th Precinct87th PrecinctThe 87th Precinct is a series of police procedural novels and stories written by Ed McBain. McBain's 87th Precinct works have been adapted, sometimes loosely, into movies and television on several occasions.-Setting:...
: Lightning" film starred Randy QuaidRandy QuaidRandall Rudy "Randy" Quaid is an American actor perhaps best known for his role as Cousin Eddie in the National Lampoon's Vacation movies, as well as his numerous supporting roles in films, including his Oscar nominated performance in The Last Detail, Independence Day, Kingpin and Brokeback Mountain...
(1995) - 87 Punch includes 1 bottle of BacardiBacardiBacardi is a family-controlled spirits company, best known as a producer of rums, including Bacardi Superior and Bacardi 151. The company sells in excess of 200 million bottles per year in nearly 100 countries...
Rum (8 years aged) and 7-up (2 liter bottle) - WengerWengerWenger is one of two companies that have manufactured Swiss Army knives. Based in Delémont, Wenger was acquired by rival Victorinox in 2005.- History :The history of Wenger S.A...
Swiss Army KnifeSwiss Army knifeThe Swiss Army knife is a brand of pocket knife or multi-tool manufactured by Victorinox AG and Wenger SA. The term "Swiss Army knife" was coined by US soldiers after World War II due to the difficulty they had in pronouncing the German name....
version XXL, listed in the Guinness Book of World Records as the world's most multi-functional penknifePenknifeA penknife, or pen knife, is a small folding pocket knife, originally used for cutting or sharpening a quill to make a pen nib. Originally, penknives did not necessarily have folding blades, but resembled a scalpel or wood knife by having a short, fixed blade at the end of a long handle...
with 87 tools - Sonnet 87Sonnet 87Sonnet 87 is one of 154 sonnets written by the English playwright and poet William Shakespeare. It's a member of the Fair Youth sequence, in which the poet expresses his love towards a young man.-Synopsis:...
by William ShakespeareWilliam ShakespeareWilliam Shakespeare was an English poet and playwright, widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's national poet and the "Bard of Avon"... - The U 87 is a popular microphone used for recording