77920588864 has 28 divisors (see below), whose sum is σ = 155736086800. Its totient is φ = 38680000128.

The previous prime is 77920588849. The next prime is 77920588891. The reversal of 77920588864 is 46888502977.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a junction number, because it is equal to n+sod(n) for n = 77920588796 and 77920588805.

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, 4370634 + ... + 4388425.

It is an arithmetic number, because the mean of its divisors is an integer number (5562003100).

Almost surely, 2^77920588864 is an apocalyptic number.

It is an amenable number.

77920588864 is a deficient number, since it is larger than the sum of its proper divisors (77815497936).

77920588864 is a wasteful number, since it uses less digits than its factorization.

77920588864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8759210 (or 8759200 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 64.

The spelling of 77920588864 in words is "seventy-seven billion, nine hundred twenty million, five hundred eighty-eight thousand, eight hundred sixty-four".