31890968 has 16 divisors (see below), whose sum is σ = 62943000. Its totient is φ = 15106176.

The previous prime is 31890959. The next prime is 31890979. The reversal of 31890968 is 86909813.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104753 + ... + 105056.

Almost surely, 2^31890968 is an apocalyptic number.

31890968 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

31890968 is a deficient number, since it is larger than the sum of its proper divisors (31052032).

31890968 is a wasteful number, since it uses less digits than its factorization.

31890968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209834 (or 209830 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 31890968 is about 5647.2088681047. The cubic root of 31890968 is about 317.1192219411.

The spelling of 31890968 in words is "thirty-one million, eight hundred ninety thousand, nine hundred sixty-eight".