31630872 has 96 divisors (see below), whose sum is σ = 99111600. Its totient is φ = 8338176.

The previous prime is 31630871. The next prime is 31630883. The reversal of 31630872 is 27803613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31630871) 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 23 ways as a sum of consecutive naturals, for example, 14254 + ... + 16322.

Almost surely, 2^31630872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31630872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49555800).

31630872 is an abundant number, since it is smaller than the sum of its proper divisors (67480728).

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

31630872 is a wasteful number, since it uses less digits than its factorization.

31630872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105 (or 2094 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 31630872 is about 5624.1329998498. The cubic root of 31630872 is about 316.2547483755.

The spelling of 31630872 in words is "thirty-one million, six hundred thirty thousand, eight hundred seventy-two".