72979251 has 16 divisors (see below), whose sum is σ = 99559584. Its totient is φ = 47533824.

The previous prime is 72979229. The next prime is 72979259. The reversal of 72979251 is 15297927.

It is not a de Polignac number, because 72979251 - 2⁶ = 72979187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72979259) 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 15 ways as a sum of consecutive naturals, for example, 43215 + ... + 44871.

It is an arithmetic number, because the mean of its divisors is an integer number (6222474).

Almost surely, 2^72979251 is an apocalyptic number.

72979251 is a deficient number, since it is larger than the sum of its proper divisors (26580333).

72979251 is a wasteful number, since it uses less digits than its factorization.

72979251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990.

The product of its digits is 79380, while the sum is 42.

The square root of 72979251 is about 8542.7894156417. The cubic root of 72979251 is about 417.8943190325.

The spelling of 72979251 in words is "seventy-two million, nine hundred seventy-nine thousand, two hundred fifty-one".