31887868 has 12 divisors (see below), whose sum is σ = 55882792. Its totient is φ = 15921360.

The previous prime is 31887859. The next prime is 31887881. The reversal of 31887868 is 86878813.

It is a super-2 number, since 2×31887868² = 2033672251170848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2238 + ... + 8293.

Almost surely, 2^31887868 is an apocalyptic number.

It is an amenable number.

31887868 is a deficient number, since it is larger than the sum of its proper divisors (23994924).

31887868 is a wasteful number, since it uses less digits than its factorization.

31887868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11292 (or 11290 counting only the distinct ones).

The product of its digits is 516096, while the sum is 49.

The square root of 31887868 is about 5646.9343895604. The cubic root of 31887868 is about 317.1089462893.

The spelling of 31887868 in words is "thirty-one million, eight hundred eighty-seven thousand, eight hundred sixty-eight".