31312648 has 32 divisors (see below), whose sum is σ = 59895000. Its totient is φ = 15344640.

The previous prime is 31312613. The next prime is 31312679. The reversal of 31312648 is 84621313.

It can be written as a sum of positive squares in 4 ways, for example, as 27060804 + 4251844 = 5202^2 + 2062^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129808 + ... + 130048.

Almost surely, 2^31312648 is an apocalyptic number.

It is an amenable number.

31312648 is a deficient number, since it is larger than the sum of its proper divisors (28582352).

31312648 is a wasteful number, since it uses less digits than its factorization.

31312648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 501 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 31312648 is about 5595.7705456889. The cubic root of 31312648 is about 315.1906060656.

The spelling of 31312648 in words is "thirty-one million, three hundred twelve thousand, six hundred forty-eight".