72956731 has 2 divisors, whose sum is σ = 72956732. Its totient is φ = 72956730.

The previous prime is 72956729. The next prime is 72956761. The reversal of 72956731 is 13765927.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72956731 - 2¹ = 72956729 is a prime.

It is a super-2 number, since 2×72956731² = 10645369196412722, which contains 22 as substring.

Together with 72956729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72956701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36478365 + 36478366.

It is an arithmetic number, because the mean of its divisors is an integer number (36478366).

Almost surely, 2^72956731 is an apocalyptic number.

72956731 is a deficient number, since it is larger than the sum of its proper divisors (1).

72956731 is an equidigital number, since it uses as much as digits as its factorization.

72956731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 40.

The square root of 72956731 is about 8541.4712432929. The cubic root of 72956731 is about 417.8513298810.

The spelling of 72956731 in words is "seventy-two million, nine hundred fifty-six thousand, seven hundred thirty-one".