79915257 has 12 divisors (see below), whose sum is σ = 117059904. Its totient is φ = 52526040.

The previous prime is 79915247. The next prime is 79915259. The reversal of 79915257 is 75251997.

It is not a de Polignac number, because 79915257 - 2⁶ = 79915193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79915259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61893 + ... + 63170.

It is an arithmetic number, because the mean of its divisors is an integer number (9754992).

Almost surely, 2^79915257 is an apocalyptic number.

It is an amenable number.

79915257 is a deficient number, since it is larger than the sum of its proper divisors (37144647).

79915257 is a wasteful number, since it uses less digits than its factorization.

79915257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125140 (or 125137 counting only the distinct ones).

The product of its digits is 198450, while the sum is 45.

The square root of 79915257 is about 8939.5333770841. The cubic root of 79915257 is about 430.7347398707.

The spelling of 79915257 in words is "seventy-nine million, nine hundred fifteen thousand, two hundred fifty-seven".