31338872 has 32 divisors (see below), whose sum is σ = 60264000. Its totient is φ = 15273600.

The previous prime is 31338863. The next prime is 31338899. The reversal of 31338872 is 27883313.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72497 + ... + 72927.

It is an arithmetic number, because the mean of its divisors is an integer number (1883250).

Almost surely, 2^31338872 is an apocalyptic number.

It is an amenable number.

31338872 is a deficient number, since it is larger than the sum of its proper divisors (28925128).

31338872 is a wasteful number, since it uses less digits than its factorization.

31338872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 643 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 31338872 is about 5598.1132535882. The cubic root of 31338872 is about 315.2785710746.

The spelling of 31338872 in words is "thirty-one million, three hundred thirty-eight thousand, eight hundred seventy-two".