|Factorization||2 × 43|
|Divisors||1, 2, 43, 86|
86 is the 25th distinct semiprime and the 13th of the form (2.q). The aliquot sum of 86 is 46 within the aliquot sequence (86,46,26,16,15,9,4,3,1,0) 86 being the 17th composite number in the 3-aliquot tree.
86 is the middle number in the second cluster of three discrete semiprimes between 85 and 87 being themselves discrete semiprimes.
Since it is possible to find sequences of 86 consecutive integers such that each inner member shares a factor with either the first or the last member, 86 is an Erdős–Woods number.
86 is a repdigit in base 6 (222).
86 = (8 x 6 = 48) + (4 x 8 = 32) + (3 x 2 = 6). That is, 86 is equal to the sum of the numbers formed in calculating its multiplicative persistence
To 86 something means "be out of" an item (e.g., restaurants) or banned from an establishment (e.g., casino.) The origin of the phrase is unclear, although the first known recorded instance of the phrase is from a 1944 book.
The term 86 comes form the movie business in Hollywood. When shooting on colour film, a camera needs an 85 filter (amber in colour) to balance the daylight. When moving indoors under tungsten light the filter is removed or replaced with a clear filter and this was referred to as the 86 filter. Therefore 86 came to mean "nothing" or to "get rid of".
In other fields
Eighty-six can also refer to:
- The capital letter V in the ASCII character encoding.
- Part of the assignation for the Toyota Trueno GT-Apex (AE86), commonly referred to as an "eight-six".
- Toyota 86, the coupe which made by Toyota and Subaru.
- The model number of F-86 Sabre and Ilyushin Il-86 aircraft.
- The model number of CPM-86 operating system.
- Part of the model number of the x86 microprocessors.
- The band Project 86 based its name on the usage of being 86'd.
- The novel Eighty-Sixed by David B. Feinberg details life as a gay man during the AIDS epidemic in 1980s New York City.
- The principal character of the TV series, Get Smart, Maxwell Smart, had been designated Agent 86. ("86" is the fictional spy term to eliminate or remove a threat - thus ironically implying he is to be feared.)
- American band Green Day has a song called "86".
- The number of the French department Vienne. This number is also reflected in the department's postal code and in the name of a local basketball club, Poitiers Basket 86.
- The designation of two US highways named Interstate 86, one in Idaho and the other in Pennsylvania and New York. A third highway in Connecticut and Massachusetts was, at one time, signed as Interstate 86, but is now designated as Interstate 84.
- +86 is the code for international direct dial phone calls to China.
- One of five ISBN Group Identifiers for books published in Serbia.
- Chick Hicks, the villain in the movie Cars, is a stock car whose number is 86. The number refers both to movie creators, Pixar's founding year, as well as the year Luxo Jr (their first short film) was released.
- An art gallery in Ventura, California displaying art pieces from such artists Billy Childish, Stacy Lande and Derek Hess; most of which include the number *86 hidden or overtly shown in the art; some of which fall under the genre of lowbrow.
- 86 is the device number for a lockout relay function in electrical engineering electrical circuit protection schemes.
- A U.S. passport applicant uses Department of State form DS-86 to cancel the application in the event of non-receipt.
- Hawk Nelson has a song called "Eighty-Six That (Anthem)" on their EP Saturday Night Action.
- In the 1950s sci-fi film Forbidden Planet, paragraph 86a details the civilian evacuation procedure.
- In the 1980s musical Little Shop of Horrors, Audrey II asks Seymour to "eighty-six" people so she can feed on their blood.
- In the 1947 song "Boogie Woogie Blue Plate" by Louis Jordan, one line is, "86 on the cherry pies."
- "eighty-six: verb  - WordReference Forums". Forum.wordreference.com. Retrieved 2012-12-04.
- "Etymology of 86". snopes.com. Retrieved 2012-12-04.
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