• 82 can be written using four 4's:
• Deleting all the even digits from 282 = 4835703278458516698824704 we obtain a prime (3573755197).
It is a happy number.
82 is nontrivially palindromic in base 3 and base 9.
82 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes.
It is an Ulam number.
82 is an undulating number in base 9.
It is a plaindrome in base 7, base 8, base 12, base 14 and base 15.
It is a nialpdrome in base 10, base 11, base 13 and base 16.
It is an upside-down number.
82 is a wasteful number, since it uses less digits than its factorization.
82 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 43.
The square root of 82 is about 9.0553851381. The cubic root of 82 is about 4.3444814858.
Multiplying 82 by its sum of digits (10), we get a triangular number (820 = T40).
Subtracting from 82 its product of digits (16), we obtain a palindrome (66).