72881631 has 12 divisors (see below), whose sum is σ = 107513952. Its totient is φ = 47553696.

The previous prime is 72881623. The next prime is 72881647. The reversal of 72881631 is 13618827.

It is not a de Polignac number, because 72881631 - 2³ = 72881623 is a prime.

It is a super-2 number, since 2×72881631² = 10623464274440322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72881621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85726 + ... + 86571.

It is an arithmetic number, because the mean of its divisors is an integer number (8959496).

Almost surely, 2^72881631 is an apocalyptic number.

72881631 is a deficient number, since it is larger than the sum of its proper divisors (34632321).

72881631 is a wasteful number, since it uses less digits than its factorization.

72881631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172350 (or 172347 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 72881631 is about 8537.0739132328. The cubic root of 72881631 is about 417.7079051044.

The spelling of 72881631 in words is "seventy-two million, eight hundred eighty-one thousand, six hundred thirty-one".