82 (number)

← 81 82 83 →
Cardinaleighty-two
Ordinal82nd
(eighty-second)
Factorization2 × 41
Divisors1, 2, 41, 82
Greek numeralΠΒ´
Roman numeralLXXXII, lxxxii
Binary10100102
Ternary100013
Senary2146
Octal1228
Duodecimal6A12
Hexadecimal5216

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

In mathematics

82 is a happy number[1] and a companion Pell number.[2] It is palindromic in bases 3 (100013), 9 (1019) and 40 (2240).

With an aliquot sum of 44, 82 is within an aliquot sequence of four composite numbers (82, 44, 40, 50, 43, 1, 0) to the prime in the 43-aliquot tree.

In physics

82 is the sixth magic number.

References

  1. ↑ "Sloane's A007770 : Happy numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  2. ↑ "Sloane's A002203 : Companion Pell numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.


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