31725972 has 48 divisors (see below), whose sum is σ = 86587200. Its totient is φ = 10018080.

The previous prime is 31725949. The next prime is 31725977. The reversal of 31725972 is 27952713.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31725977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5679 + ... + 9782.

It is an arithmetic number, because the mean of its divisors is an integer number (1803900).

Almost surely, 2^31725972 is an apocalyptic number.

It is an amenable number.

31725972 is an abundant number, since it is smaller than the sum of its proper divisors (54861228).

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

31725972 is a wasteful number, since it uses less digits than its factorization.

31725972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15493 (or 15485 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 31725972 is about 5632.5812910246. The cubic root of 31725972 is about 316.5713771769.

The spelling of 31725972 in words is "thirty-one million, seven hundred twenty-five thousand, nine hundred seventy-two".