31308868 has 6 divisors (see below), whose sum is σ = 54790526. Its totient is φ = 15654432.

The previous prime is 31308863. The next prime is 31308887. The reversal of 31308868 is 86880313.

It can be written as a sum of positive squares in only one way, i.e., 17825284 + 13483584 = 4222^2 + 3672^2 .

It is not an unprimeable number, because it can be changed into a prime (31308863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3913605 + ... + 3913612.

Almost surely, 2^31308868 is an apocalyptic number.

It is an amenable number.

31308868 is a deficient number, since it is larger than the sum of its proper divisors (23481658).

31308868 is a wasteful number, since it uses less digits than its factorization.

31308868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7827221 (or 7827219 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 31308868 is about 5595.4327804022. The cubic root of 31308868 is about 315.1779224962.

The spelling of 31308868 in words is "thirty-one million, three hundred eight thousand, eight hundred sixty-eight".