77939904 has 56 divisors (see below), whose sum is σ = 235679488. Its totient is φ = 22268160.

The previous prime is 77939903. The next prime is 77939909. The reversal of 77939904 is 40993977.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (77939903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27652 + ... + 30339.

Almost surely, 2^77939904 is an apocalyptic number.

It is an amenable number.

77939904 is an abundant number, since it is smaller than the sum of its proper divisors (157739584).

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

77939904 is a wasteful number, since it uses less digits than its factorization.

77939904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58013 (or 58003 counting only the distinct ones).

The product of its (nonzero) digits is 428652, while the sum is 48.

The square root of 77939904 is about 8828.3579447143. The cubic root of 77939904 is about 427.1561093373.

The spelling of 77939904 in words is "seventy-seven million, nine hundred thirty-nine thousand, nine hundred four".