31690912 has 24 divisors (see below), whose sum is σ = 68064192. Its totient is φ = 14404800.

The previous prime is 31690889. The next prime is 31690913. The reversal of 31690912 is 21909613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31690913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44664 + ... + 45367.

It is an arithmetic number, because the mean of its divisors is an integer number (2836008).

Almost surely, 2^31690912 is an apocalyptic number.

31690912 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31690912 is an abundant number, since it is smaller than the sum of its proper divisors (36373280).

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

31690912 is a wasteful number, since it uses less digits than its factorization.

31690912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90052 (or 90044 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 31690912 is about 5629.4681809208. The cubic root of 31690912 is about 316.4547210877.

The spelling of 31690912 in words is "thirty-one million, six hundred ninety thousand, nine hundred twelve".