78979520 has 28 divisors (see below), whose sum is σ = 188070744. Its totient is φ = 31591680.

The previous prime is 78979469. The next prime is 78979553. The reversal of 78979520 is 2597987.

It is a congruent number.

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, 123086 + ... + 123725.

Almost surely, 2^78979520 is an apocalyptic number.

It is an amenable number.

78979520 is an abundant number, since it is smaller than the sum of its proper divisors (109091224).

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

78979520 is a wasteful number, since it uses less digits than its factorization.

78979520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246828 (or 246818 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 78979520 is about 8887.0422526283. The cubic root of 78979520 is about 429.0469608432.

The spelling of 78979520 in words is "seventy-eight million, nine hundred seventy-nine thousand, five hundred twenty".