78664012 has 18 divisors (see below), whose sum is σ = 160137852. Its totient is φ = 33713064.

The previous prime is 78663973. The next prime is 78664021. The reversal of 78664012 is 21046687.

It is a super-2 number, since 2×78664012² = 12376053567872288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 200478 + ... + 200869.

Almost surely, 2^78664012 is an apocalyptic number.

It is an amenable number.

78664012 is an abundant number, since it is smaller than the sum of its proper divisors (81473840).

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

78664012 is a wasteful number, since it uses less digits than its factorization.

78664012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401365 (or 401356 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 78664012 is about 8869.2734764466. The cubic root of 78664012 is about 428.4748783351.

The spelling of 78664012 in words is "seventy-eight million, six hundred sixty-four thousand, twelve".