86 (number)

86 (eighty-six) is the natural number following 85 and preceding 87.

← 85 87 → 86
← 80 81 82 83 84 85 86 87 88 89 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	eighty-six
Ordinal	86th (eighty-sixth)
Numeral system	86
Factorization	$2 \cdot 43$
Divisors	1, 2, 43, 86
Roman numeral	LXXXVI
Binary	10101102
Octal	1268
Duodecimal	7212
Hexadecimal	5616

In mathematics

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.

86 is a semiprime, nontotient, a noncototient, a happy number, and a self number. It appears in the Padovan sequence, preceded by the terms 37, 49, 65 (it is the sum of the first two of these).

Since it is possible to find sequences of 86 consecutive integers such that each inner member 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).

In science

86 is the atomic number of radon. There are 86 metals on the modern periodic table.

Slang

To 86 something means "be out of" an item (e.g., restaurants) or banned from an establishment (e.g., casino.)

In other fields

Eighty-six is also:

• 86 (term), a slang term
• 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".
• 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.
• American band Green Day has a song called "86".
• The number of the French department Vienne.
• The designation of two highways named Interstate 86, one in Idaho and the other in Pennsylvania and New York.
• +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, CA 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 US passport applicant uses US Department of State form DS-86 to cancel a US passport application in the event of non-receipt.
• Hawk Nelson has a song called "Eighty-Six That (Anthem)" on their EP Saturday Night Action.
• In certain circles, 86 is understood to be a "funny number." In these circles, the number is useful in many comedic applications.

See also the year AD 86, 86 BC, or 1986.

Cultural references

• In Forbidden Planet, paragraph 86a details the civilian evacuation procedure.