31368816 has 40 divisors (see below), whose sum is σ = 90041360. Its totient is φ = 10456128.

The previous prime is 31368811. The next prime is 31368833. The reversal of 31368816 is 61886313.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31368811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35875 + ... + 36738.

It is an arithmetic number, because the mean of its divisors is an integer number (2251034).

Almost surely, 2^31368816 is an apocalyptic number.

31368816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31368816 is an abundant number, since it is smaller than the sum of its proper divisors (58672544).

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

31368816 is a wasteful number, since it uses less digits than its factorization.

31368816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72630 (or 72618 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 31368816 is about 5600.7870875440. The cubic root of 31368816 is about 315.3789543547.

The spelling of 31368816 in words is "thirty-one million, three hundred sixty-eight thousand, eight hundred sixteen".