82 (eighty-two) is the natural number following 81 and preceding 83.
In mathematics
82 is:
- the twenty-seventh semiprime 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.
- a happy number.
- palindromic in bases 3 (10001<sub>3</sub>), 9 (101<sub>9</sub>) and 40 (22<sub>40</sub>).
In science
- The sixth magic number.