31709968 has 20 divisors (see below), whose sum is σ = 62218240. Its totient is φ = 15653664.

The previous prime is 31709941. The next prime is 31709987. The reversal of 31709968 is 86990713.

It is a super-2 number, since 2×31709968² = 2011044141122048, which contains 22 as substring.

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, 11280 + ... + 13807.

It is an arithmetic number, because the mean of its divisors is an integer number (3110912).

Almost surely, 2^31709968 is an apocalyptic number.

It is an amenable number.

31709968 is a deficient number, since it is larger than the sum of its proper divisors (30508272).

31709968 is a wasteful number, since it uses less digits than its factorization.

31709968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25174 (or 25168 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 31709968 is about 5631.1604487885. The cubic root of 31709968 is about 316.5181373006.

The spelling of 31709968 in words is "thirty-one million, seven hundred nine thousand, nine hundred sixty-eight".