31430864 has 20 divisors (see below), whose sum is σ = 64103040. Its totient is φ = 14888160.

The previous prime is 31430863. The next prime is 31430873. The reversal of 31430864 is 46803413.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31430863) 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, 51392 + ... + 51999.

It is an arithmetic number, because the mean of its divisors is an integer number (3205152).

Almost surely, 2^31430864 is an apocalyptic number.

It is an amenable number.

31430864 is an abundant number, since it is smaller than the sum of its proper divisors (32672176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31430864 is a wasteful number, since it uses less digits than its factorization.

31430864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103418 (or 103412 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 31430864 is about 5606.3235725384. The cubic root of 31430864 is about 315.5867588737.

The spelling of 31430864 in words is "thirty-one million, four hundred thirty thousand, eight hundred sixty-four".