77931372 has 12 divisors (see below), whose sum is σ = 181839896. Its totient is φ = 25977120.

The previous prime is 77931353. The next prime is 77931379. The reversal of 77931372 is 27313977.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 77931372.

It is not an unprimeable number, because it can be changed into a prime (77931379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3247129 + ... + 3247152.

Almost surely, 2^77931372 is an apocalyptic number.

It is an amenable number.

77931372 is an abundant number, since it is smaller than the sum of its proper divisors (103908524).

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

77931372 is a wasteful number, since it uses less digits than its factorization.

77931372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6494288 (or 6494286 counting only the distinct ones).

The product of its digits is 55566, while the sum is 39.

The square root of 77931372 is about 8827.8747159212. The cubic root of 77931372 is about 427.1405219906.

The spelling of 77931372 in words is "seventy-seven million, nine hundred thirty-one thousand, three hundred seventy-two".