• 82 can be written using four 4's:

• Deleting all the even digits from 2^{82} = 4835703278458516698824704 we obtain a prime (3573755197).

82 has 4 divisors (see below), whose sum is σ = 126. Its totient is φ = 40.

The previous prime is 79. The next prime is 83. The reversal of 82 is 28.

It is a happy number.

82 is nontrivially palindromic in base 3 and base 9.

It is a Cunningham number, because it is equal to 3^{4}+1.

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 can be written as a sum of positive squares in only one way, i.e., 81 + 1 = 9^2 + 1^2 .

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 a pernicious number, because its binary representation contains a prime number (3) of ones.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19 + ... + 22.

82 is a deficient number, since it is larger than the sum of its proper divisors (44).

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 product of its digits is 16, while the sum is 10.

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 = T_{40}).

Subtracting from 82 its product of digits (16), we obtain a palindrome (66).

The spelling of 82 in words is "eighty-two", and thus it is an aban number and an uban number.

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