77639012 has 24 divisors (see below), whose sum is σ = 149177280. Its totient is φ = 35062560.

The previous prime is 77638993. The next prime is 77639021. The reversal of 77639012 is 21093677.

It is a super-2 number, since 2×77639012² = 12055632368672288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1289 + ... + 12527.

It is an arithmetic number, because the mean of its divisors is an integer number (6215720).

Almost surely, 2^77639012 is an apocalyptic number.

It is an amenable number.

77639012 is a deficient number, since it is larger than the sum of its proper divisors (71538268).

77639012 is a wasteful number, since it uses less digits than its factorization.

77639012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11411 (or 11409 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 77639012 is about 8811.3002445723. The cubic root of 77639012 is about 426.6057125924.

The spelling of 77639012 in words is "seventy-seven million, six hundred thirty-nine thousand, twelve".