31142868 has 24 divisors (see below), whose sum is σ = 75173280. Its totient is φ = 10022880.

The previous prime is 31142857. The next prime is 31142869. The reversal of 31142868 is 86824113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31142869) 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, 44398 + ... + 45093.

It is an arithmetic number, because the mean of its divisors is an integer number (3132220).

Almost surely, 2^31142868 is an apocalyptic number.

It is an amenable number.

31142868 is an abundant number, since it is smaller than the sum of its proper divisors (44030412).

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

31142868 is a wasteful number, since it uses less digits than its factorization.

31142868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89527 (or 89525 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 31142868 is about 5580.5795397969. The cubic root of 31142868 is about 314.6199094040.

The spelling of 31142868 in words is "thirty-one million, one hundred forty-two thousand, eight hundred sixty-eight".