31047472 has 20 divisors (see below), whose sum is σ = 60833160. Its totient is φ = 15348608.

The previous prime is 31047433. The next prime is 31047479. The reversal of 31047472 is 27474013.

It is a self number, because there is not a number n which added to its sum of digits gives 31047472.

It is not an unprimeable number, because it can be changed into a prime (31047479) 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, 9478 + ... + 12325.

It is an arithmetic number, because the mean of its divisors is an integer number (3041658).

Almost surely, 2^31047472 is an apocalyptic number.

It is an amenable number.

31047472 is a deficient number, since it is larger than the sum of its proper divisors (29785688).

31047472 is a wasteful number, since it uses less digits than its factorization.

31047472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21900 (or 21894 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 31047472 is about 5572.0258434433. The cubic root of 31047472 is about 314.2983357387.

The spelling of 31047472 in words is "thirty-one million, forty-seven thousand, four hundred seventy-two".