31928 has 16 divisors (see below), whose sum is σ = 64680. Its totient is φ = 14688.

The previous prime is 31907. The next prime is 31957. The reversal of 31928 is 82913.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50 + ... + 257.

2³¹⁹²⁸ is an apocalyptic number.

It is an amenable number.

31928 is an abundant number, since it is smaller than the sum of its proper divisors (32752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32340).

31928 is a wasteful number, since it uses less digits than its factorization.

31928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 322 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 31928 is about 178.6840787535. The cubic root of 31928 is about 31.7241921430.

It can be divided in two parts, 31 and 928, that added together give a palindrome (959).

The spelling of 31928 in words is "thirty-one thousand, nine hundred twenty-eight".