77931045 has 32 divisors (see below), whose sum is σ = 139574400. Its totient is φ = 41254272.

The previous prime is 77931031. The next prime is 77931047. The reversal of 77931045 is 54013977.

It is a happy number.

It is not a de Polignac number, because 77931045 - 2⁵ = 77931013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77931047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16689 + ... + 20841.

It is an arithmetic number, because the mean of its divisors is an integer number (4361700).

Almost surely, 2^77931045 is an apocalyptic number.

It is an amenable number.

77931045 is a deficient number, since it is larger than the sum of its proper divisors (61643355).

77931045 is a wasteful number, since it uses less digits than its factorization.

77931045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306 (or 4300 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 77931045 is about 8827.8561950227. The cubic root of 77931045 is about 427.1399245626.

The spelling of 77931045 in words is "seventy-seven million, nine hundred thirty-one thousand, forty-five".