31990864 has 20 divisors (see below), whose sum is σ = 62117056. Its totient is φ = 15960672.

The previous prime is 31990831. The next prime is 31990897. The reversal of 31990864 is 46809913.

It is an interprime number because it is at equal distance from previous prime (31990831) and next prime (31990897).

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, 6457 + ... + 10279.

Almost surely, 2^31990864 is an apocalyptic number.

It is an amenable number.

31990864 is a deficient number, since it is larger than the sum of its proper divisors (30126192).

31990864 is a wasteful number, since it uses less digits than its factorization.

31990864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4354 (or 4348 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 31990864 is about 5656.0466759036. The cubic root of 31990864 is about 317.4499939845.

The spelling of 31990864 in words is "thirty-one million, nine hundred ninety thousand, eight hundred sixty-four".