78564762664 has 16 divisors (see below), whose sum is σ = 147314629620. Its totient is φ = 39280861440.

The previous prime is 78564762587. The next prime is 78564762701. The reversal of 78564762664 is 46626746587.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 53843489764 + 24721272900 = 232042^2 + 157230^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47104 + ... + 399184.

Almost surely, 2^78564762664 is an apocalyptic number.

It is an amenable number.

78564762664 is a deficient number, since it is larger than the sum of its proper divisors (68749866956).

78564762664 is a wasteful number, since it uses less digits than its factorization.

78564762664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379980 (or 379976 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 61.

The spelling of 78564762664 in words is "seventy-eight billion, five hundred sixty-four million, seven hundred sixty-two thousand, six hundred sixty-four".