72910331 has 16 divisors (see below), whose sum is σ = 83661984. Its totient is φ = 62943744.

The previous prime is 72910307. The next prime is 72910333. The reversal of 72910331 is 13301927.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72910331 is a prime.

It is a super-2 number, since 2×72910331² = 10631832733059122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72910331.

It is not an unprimeable number, because it can be changed into a prime (72910333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37280 + ... + 39186.

It is an arithmetic number, because the mean of its divisors is an integer number (5228874).

Almost surely, 2^72910331 is an apocalyptic number.

72910331 is a deficient number, since it is larger than the sum of its proper divisors (10751653).

72910331 is a wasteful number, since it uses less digits than its factorization.

72910331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 72910331 is about 8538.7546515871. The cubic root of 72910331 is about 417.7627275310.

The spelling of 72910331 in words is "seventy-two million, nine hundred ten thousand, three hundred thirty-one".