72515631 has 16 divisors (see below), whose sum is σ = 100677600. Its totient is φ = 46370688.

The previous prime is 72515627. The next prime is 72515669. The reversal of 72515631 is 13651527.

It is not a de Polignac number, because 72515631 - 2² = 72515627 is a prime.

It is a super-2 number, since 2×72515631² = 10517033478656322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72515621) 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, 11005 + ... + 16313.

It is an arithmetic number, because the mean of its divisors is an integer number (6292350).

Almost surely, 2^72515631 is an apocalyptic number.

72515631 is a deficient number, since it is larger than the sum of its proper divisors (28161969).

72515631 is a wasteful number, since it uses less digits than its factorization.

72515631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5498.

The product of its digits is 6300, while the sum is 30.

The square root of 72515631 is about 8515.6110174197. The cubic root of 72515631 is about 417.0075104031.

The spelling of 72515631 in words is "seventy-two million, five hundred fifteen thousand, six hundred thirty-one".