31445864 has 16 divisors (see below), whose sum is σ = 59304420. Its totient is φ = 15631360.

The previous prime is 31445863. The next prime is 31445891. The reversal of 31445864 is 46854413.

It can be written as a sum of positive squares in 2 ways, for example, as 30360100 + 1085764 = 5510^2 + 1042^2 .

It is not an unprimeable number, because it can be changed into a prime (31445861) 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, 9977 + ... + 12744.

Almost surely, 2^31445864 is an apocalyptic number.

It is an amenable number.

31445864 is a deficient number, since it is larger than the sum of its proper divisors (27858556).

31445864 is a wasteful number, since it uses less digits than its factorization.

31445864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22900 (or 22896 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

The square root of 31445864 is about 5607.6611880534. The cubic root of 31445864 is about 315.6369542118.

The spelling of 31445864 in words is "thirty-one million, four hundred forty-five thousand, eight hundred sixty-four".