72444731 has 2 divisors, whose sum is σ = 72444732. Its totient is φ = 72444730.

The previous prime is 72444727. The next prime is 72444761. The reversal of 72444731 is 13744427.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72444731 - 2² = 72444727 is a prime.

It is a super-2 number, since 2×72444731² = 10496478099324722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_4253396 and since 72444731 and 4253396 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (72444721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36222365 + 36222366.

It is an arithmetic number, because the mean of its divisors is an integer number (36222366).

Almost surely, 2^72444731 is an apocalyptic number.

72444731 is a deficient number, since it is larger than the sum of its proper divisors (1).

72444731 is an equidigital number, since it uses as much as digits as its factorization.

72444731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 32.

The square root of 72444731 is about 8511.4470567583. The cubic root of 72444731 is about 416.8715605257.

The spelling of 72444731 in words is "seventy-two million, four hundred forty-four thousand, seven hundred thirty-one".