31872638 has 12 divisors (see below), whose sum is σ = 55614672. Its totient is φ = 13659660.

The previous prime is 31872623. The next prime is 31872677. The reversal of 31872638 is 83627813.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 162518 + ... + 162713.

It is an arithmetic number, because the mean of its divisors is an integer number (4634556).

Almost surely, 2^31872638 is an apocalyptic number.

31872638 is a deficient number, since it is larger than the sum of its proper divisors (23742034).

31872638 is a wasteful number, since it uses less digits than its factorization.

31872638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325247 (or 325240 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 31872638 is about 5645.5857092068. The cubic root of 31872638 is about 317.0584533313.

The spelling of 31872638 in words is "thirty-one million, eight hundred seventy-two thousand, six hundred thirty-eight".