79657920 has 168 divisors, whose sum is σ = 290285424. Its totient is φ = 19980288.

The previous prime is 79657891. The next prime is 79657939. The reversal of 79657920 is 2975697.

79657920 is a `hidden beast` number, since 79 + 6 + 579 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48147 + ... + 49773.

Almost surely, 2^79657920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79657920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145142712).

79657920 is an abundant number, since it is smaller than the sum of its proper divisors (210627504).

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

79657920 is a wasteful number, since it uses less digits than its factorization.

79657920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667 (or 1654 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 79657920 is about 8925.1285705025. The cubic root of 79657920 is about 430.2719030261.

The spelling of 79657920 in words is "seventy-nine million, six hundred fifty-seven thousand, nine hundred twenty".