82

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

← 81 83 → 82
← 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-second
Ordinal	82nd (eighty-second)
Numeral system	82
Factorization
Divisors	1, 2, 41, 82
Roman numeral	LXXXII
Binary	10100102
Octal	1228
Duodecimal	6A12
Hexadecimal	5216

In mathematics

Eighty-two is the twenty-third biprime and the twelfth of the form (2.q). The aliquot sum of 82 is 44 within the aliquot sequence (82,44,40,50,43,1,0)) 82 being the eighth composite number in the 43-aliquot tree.

Eighty-two is a companion Pell number.

Eighty-two is a happy number

In astronomy

• Messier 82, a starburst galaxy in the constellation Ursa Major
• The New General Catalogue object NGC 82, a single star in the constellation Andromeda
• The Saros number of the solar eclipse series which began on -293 April 22 and ended on 969 May 19. The duration of Saros series 82 was 1262.1 years, and it contained 71 solar eclipses. The Saros number of the lunar eclipse series which began on -226 September 10 and ended on 1289 March 8. The duration of Saros series 82 was 1514.5 years, and it contained 85 lunar eclipses.

In other fields

Eighty-two is also:

• The atomic number of lead
• In physics, the sixth Magic Number
• the model number of: Mark 82 bomb, a nonguided general purpose bomb
• the number of the French department Tarn-et-Garonne
  

  

  Mark 82 bomb
• 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.
• The number of Trip Murphy's (Matt Dillon) car in Herbie Fully Loaded (2005).
• The number (*82) to unblock your caller ID for phones that block anonymous incoming calls
• The Shannon number, or the theoretical number of possible chess games, is approximately equal to 82 factorial, or the number of different ways to arrange 82 objects. This number is about 4.75364334 × 10¹²², or 10⁴² times the number of atoms in the universe!
• I Spy ran on television 1965-1968 for 82 episodes
• Raymond counts fallen toothpicks in increments of 82 in the movie Rain Man.

In sports

• Both the NBA and NHL operate 82-game regular seasons.