31661868 has 24 divisors (see below), whose sum is σ = 84431872. Its totient is φ = 9046224.

The previous prime is 31661863. The next prime is 31661887. The reversal of 31661868 is 86816613.

It is not an unprimeable number, because it can be changed into a prime (31661863) 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, 188380 + ... + 188547.

Almost surely, 2^31661868 is an apocalyptic number.

It is an amenable number.

31661868 is an abundant number, since it is smaller than the sum of its proper divisors (52770004).

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

31661868 is a wasteful number, since it uses less digits than its factorization.

31661868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376941 (or 376939 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 31661868 is about 5626.8879498351. The cubic root of 31661868 is about 316.3580170215.

The spelling of 31661868 in words is "thirty-one million, six hundred sixty-one thousand, eight hundred sixty-eight".