79957215 has 48 divisors (see below), whose sum is σ = 154103040. Its totient is φ = 38085120.

The previous prime is 79957193. The next prime is 79957217. The reversal of 79957215 is 51275997.

79957215 is a `hidden beast` number, since 79 + 9 + 572 + 1 + 5 = 666.

It is not a de Polignac number, because 79957215 - 2⁵ = 79957183 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79957217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15931 + ... + 20339.

It is an arithmetic number, because the mean of its divisors is an integer number (3210480).

Almost surely, 2^79957215 is an apocalyptic number.

79957215 is a deficient number, since it is larger than the sum of its proper divisors (74145825).

79957215 is a wasteful number, since it uses less digits than its factorization.

79957215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4464 (or 4461 counting only the distinct ones).

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

The square root of 79957215 is about 8941.8798359182. The cubic root of 79957215 is about 430.8101097350.

The spelling of 79957215 in words is "seventy-nine million, nine hundred fifty-seven thousand, two hundred fifteen".