31304872 has 8 divisors (see below), whose sum is σ = 58696650. Its totient is φ = 15652432.

The previous prime is 31304857. The next prime is 31304873. The reversal of 31304872 is 27840313.

It can be written as a sum of positive squares in only one way, i.e., 16048036 + 15256836 = 4006^2 + 3906^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31304872.

It is not an unprimeable number, because it can be changed into a prime (31304873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1956547 + ... + 1956562.

Almost surely, 2^31304872 is an apocalyptic number.

It is an amenable number.

31304872 is a deficient number, since it is larger than the sum of its proper divisors (27391778).

31304872 is a wasteful number, since it uses less digits than its factorization.

31304872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3913115 (or 3913111 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 31304872 is about 5595.0756920707. The cubic root of 31304872 is about 315.1645130413.

The spelling of 31304872 in words is "thirty-one million, three hundred four thousand, eight hundred seventy-two".