77920660 has 24 divisors (see below), whose sum is σ = 164376576. Its totient is φ = 31026720.

The previous prime is 77920643. The next prime is 77920679. The reversal of 77920660 is 6602977.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4276 + ... + 13195.

It is an arithmetic number, because the mean of its divisors is an integer number (6849024).

Almost surely, 2^77920660 is an apocalyptic number.

It is an amenable number.

77920660 is an abundant number, since it is smaller than the sum of its proper divisors (86455916).

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

77920660 is a wasteful number, since it uses less digits than its factorization.

77920660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17703 (or 17701 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 77920660 is about 8827.2679805249. The cubic root of 77920660 is about 427.1209503306.

The spelling of 77920660 in words is "seventy-seven million, nine hundred twenty thousand, six hundred sixty".