82 (number)

← 81 82 83 →
← 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-two
Ordinal	82nd (eighty-second)
Factorization	2 × 41
Divisors	1, 2, 41, 82
Greek numeral	ΠΒ´
Roman numeral	LXXXII
Binary	10100102
Ternary	100013
Senary	2146
Octal	1228
Duodecimal	6A12
Hexadecimal	5216

82 (eighty-two) is the natural number following 81 and preceding 83.

In mathematics

82 is:

• the twenty-seventh semiprime^[1] and the thirteenth of the form (2.q).
• with an aliquot sum of 44, within an aliquot sequence of four composite numbers (82,44,40,50,43,1,0) to the Prime in the 43-aliquot tree.
• a companion Pell number.^[2]
• a happy number.^[3]
• palindromic in bases 3 (10001₃), 9 (101₉) and 40 (22₄₀).

In science

• The atomic number of lead.
• The sixth magic number.
• Messier 82, a starburst galaxy in the constellation Ursa Major.
• The New General Catalogue object NGC 82, a single star in the constellation Andromeda.

In other fields

Eighty-two is also:

• The model number of: Mark 82 bomb, a nonguided general-purpose bomb.
• The number of the French department Tarn-et-Garonne.
• The code for international direct dial phone calls to South Korea.
• The ISBN Group Identifier for books published in Norway.
• Title of Dennis Smith's book about firefighters, Report from Engine Co. 82.
• The year AD 82, 82 BC, or 1982, stylized as '82.
• The number of Trip Murphy's (Matt Dillon) car in Herbie: Fully Loaded (2005).
• The second studio album by African electropop outfit Just a Band (2009).
• The number (*82) to unblock your caller ID for phones that block anonymous incoming calls.
• The very significant number that appears at the end of Kurt Vonnegut's book Hocus Pocus.

In sports

• Both the NBA and NHL operate 82-game regular seasons.
• In Major League Baseball, the number of games a team must win to secure a winning season.

References

1. Sloane, N. J. A. (ed.). "Sequence A001358". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
2. "Sloane's A002203 : Companion Pell numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
3. "Sloane's A007770 : Happy numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.