72540831 has 32 divisors (see below), whose sum is σ = 109483776. Its totient is φ = 42688800.

The previous prime is 72540829. The next prime is 72540847. The reversal of 72540831 is 13804527.

It is not a de Polignac number, because 72540831 - 2¹ = 72540829 is a prime.

It is a super-2 number, since 2×72540831² = 10524344324341122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72540821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147496 + ... + 147986.

It is an arithmetic number, because the mean of its divisors is an integer number (3421368).

Almost surely, 2^72540831 is an apocalyptic number.

72540831 is a deficient number, since it is larger than the sum of its proper divisors (36942945).

72540831 is a wasteful number, since it uses less digits than its factorization.

72540831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 72540831 is about 8517.0905243516. The cubic root of 72540831 is about 417.0558097470.

The spelling of 72540831 in words is "seventy-two million, five hundred forty thousand, eight hundred thirty-one".