77938928 has 10 divisors (see below), whose sum is σ = 151006704. Its totient is φ = 38969456.

The previous prime is 77938871. The next prime is 77938933. The reversal of 77938928 is 82983977.

It is a self number, because there is not a number n which added to its sum of digits gives 77938928.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2435576 + ... + 2435607.

Almost surely, 2^77938928 is an apocalyptic number.

It is an amenable number.

77938928 is a deficient number, since it is larger than the sum of its proper divisors (73067776).

77938928 is a wasteful number, since it uses less digits than its factorization.

77938928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4871191 (or 4871185 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 53.

The square root of 77938928 is about 8828.3026681237. The cubic root of 77938928 is about 427.1543263135.

The spelling of 77938928 in words is "seventy-seven million, nine hundred thirty-eight thousand, nine hundred twenty-eight".