31920648 has 32 divisors (see below), whose sum is σ = 82555200. Its totient is φ = 10273088.

The previous prime is 31920631. The next prime is 31920653. The reversal of 31920648 is 84602913.

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, 22236 + ... + 23627.

It is an arithmetic number, because the mean of its divisors is an integer number (2579850).

Almost surely, 2^31920648 is an apocalyptic number.

It is an amenable number.

31920648 is an abundant number, since it is smaller than the sum of its proper divisors (50634552).

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

31920648 is a wasteful number, since it uses less digits than its factorization.

31920648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45901 (or 45897 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 31920648 is about 5649.8361038175. The cubic root of 31920648 is about 317.2175693286.

The spelling of 31920648 in words is "thirty-one million, nine hundred twenty thousand, six hundred forty-eight".