31402864 has 20 divisors (see below), whose sum is σ = 60933600. Its totient is φ = 15678080.

The previous prime is 31402841. The next prime is 31402867. The reversal of 31402864 is 46820413.

It is a super-2 number, since 2×31402864² = 1972279734804992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402867) 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, 15849 + ... + 17719.

It is an arithmetic number, because the mean of its divisors is an integer number (3046680).

Almost surely, 2^31402864 is an apocalyptic number.

It is an amenable number.

31402864 is a deficient number, since it is larger than the sum of its proper divisors (29530736).

31402864 is a wasteful number, since it uses less digits than its factorization.

31402864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2928 (or 2922 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 31402864 is about 5603.8258359803. The cubic root of 31402864 is about 315.4930181639.

The spelling of 31402864 in words is "thirty-one million, four hundred two thousand, eight hundred sixty-four".