31913768 has 16 divisors (see below), whose sum is σ = 62988000. Its totient is φ = 15116976.

The previous prime is 31913767. The next prime is 31913771. The reversal of 31913768 is 86731913.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (31913767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104828 + ... + 105131.

It is an arithmetic number, because the mean of its divisors is an integer number (3936750).

Almost surely, 2^31913768 is an apocalyptic number.

31913768 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

31913768 is a deficient number, since it is larger than the sum of its proper divisors (31074232).

31913768 is a wasteful number, since it uses less digits than its factorization.

31913768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209984 (or 209980 counting only the distinct ones).

The product of its digits is 27216, while the sum is 38.

The square root of 31913768 is about 5649.2272037864. The cubic root of 31913768 is about 317.1947772506.

The spelling of 31913768 in words is "thirty-one million, nine hundred thirteen thousand, seven hundred sixty-eight".