31568140 has 12 divisors (see below), whose sum is σ = 66293136. Its totient is φ = 12627248.

The previous prime is 31568129. The next prime is 31568179. The reversal of 31568140 is 4186513.

It is a junction number, because it is equal to n+sod(n) for n = 31568099 and 31568108.

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 3 ways as a sum of consecutive naturals, for example, 789184 + ... + 789223.

It is an arithmetic number, because the mean of its divisors is an integer number (5524428).

Almost surely, 2^31568140 is an apocalyptic number.

It is an amenable number.

31568140 is an abundant number, since it is smaller than the sum of its proper divisors (34724996).

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

31568140 is a wasteful number, since it uses less digits than its factorization.

31568140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578416 (or 1578414 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 31568140 is about 5618.5531945511. The cubic root of 31568140 is about 316.0455390227.

The spelling of 31568140 in words is "thirty-one million, five hundred sixty-eight thousand, one hundred forty".