76821966 has 32 divisors (see below), whose sum is σ = 183849120. Its totient is φ = 23637312.

The previous prime is 76821911. The next prime is 76821989. The reversal of 76821966 is 66912867.

It is a super-2 number, since 2×76821966² = 11803228920210312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54015 + ... + 55418.

It is an arithmetic number, because the mean of its divisors is an integer number (5745285).

Almost surely, 2^76821966 is an apocalyptic number.

76821966 is an abundant number, since it is smaller than the sum of its proper divisors (107027154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

76821966 is a wasteful number, since it uses less digits than its factorization.

76821966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109457 (or 109451 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 76821966 is about 8764.8140881595. The cubic root of 76821966 is about 425.1039487374.

Subtracting from 76821966 its reverse (66912867), we obtain a palindrome (9909099).

The spelling of 76821966 in words is "seventy-six million, eight hundred twenty-one thousand, nine hundred sixty-six".