31631648 has 12 divisors (see below), whose sum is σ = 62274870. Its totient is φ = 15815808.

The previous prime is 31631641. The next prime is 31631659. The reversal of 31631648 is 84613613.

It can be written as a sum of positive squares in only one way, i.e., 27583504 + 4048144 = 5252^2 + 2012^2 .

It is a super-2 number, since 2×31631648² = 2001122310391808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 988489 = 31631648 / (3 + 1 + 6 + 3 + 1 + 6 + 4 + 8).

It is not an unprimeable number, because it can be changed into a prime (31631641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494213 + ... + 494276.

Almost surely, 2^31631648 is an apocalyptic number.

It is an amenable number.

31631648 is a deficient number, since it is larger than the sum of its proper divisors (30643222).

31631648 is an equidigital number, since it uses as much as digits as its factorization.

31631648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988499 (or 988491 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 31631648 is about 5624.2019878379. The cubic root of 31631648 is about 316.2573345797.

The spelling of 31631648 in words is "thirty-one million, six hundred thirty-one thousand, six hundred forty-eight".