79972775 has 12 divisors (see below), whose sum is σ = 99306144. Its totient is φ = 63888000.

The previous prime is 79972759. The next prime is 79972829. The reversal of 79972775 is 57727997.

It is not a de Polignac number, because 79972775 - 2⁴ = 79972759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20210 + ... + 23840.

It is an arithmetic number, because the mean of its divisors is an integer number (8275512).

Almost surely, 2^79972775 is an apocalyptic number.

79972775 is a deficient number, since it is larger than the sum of its proper divisors (19333369).

79972775 is a wasteful number, since it uses less digits than its factorization.

79972775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4522 (or 4517 counting only the distinct ones).

The product of its digits is 1944810, while the sum is 53.

The square root of 79972775 is about 8942.7498567275. The cubic root of 79972775 is about 430.8380537236.

The spelling of 79972775 in words is "seventy-nine million, nine hundred seventy-two thousand, seven hundred seventy-five".