31213768 has 32 divisors (see below), whose sum is σ = 62264160. Its totient is φ = 14618880.

The previous prime is 31213753. The next prime is 31213799. The reversal of 31213768 is 86731213.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 38083 + ... + 38893.

It is an arithmetic number, because the mean of its divisors is an integer number (1945755).

Almost surely, 2^31213768 is an apocalyptic number.

It is an amenable number.

31213768 is a deficient number, since it is larger than the sum of its proper divisors (31050392).

31213768 is a wasteful number, since it uses less digits than its factorization.

31213768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117 (or 1113 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 31213768 is about 5586.9283152731. The cubic root of 31213768 is about 314.8584835052.

It can be divided in two parts, 3121 and 3768, that added together give a square (6889 = 83²).

The spelling of 31213768 in words is "thirty-one million, two hundred thirteen thousand, seven hundred sixty-eight".