31868688 has 40 divisors (see below), whose sum is σ = 83887488. Its totient is φ = 10421632.

The previous prime is 31868677. The next prime is 31868689. The reversal of 31868688 is 88686813.

It is a happy number.

It is a super-2 number, since 2×31868688² = 2031226549682688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (31868689) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3720 + ... + 8807.

Almost surely, 2^31868688 is an apocalyptic number.

It is an amenable number.

31868688 is an abundant number, since it is smaller than the sum of its proper divisors (52018800).

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

31868688 is a wasteful number, since it uses less digits than its factorization.

31868688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12591 (or 12585 counting only the distinct ones).

The product of its digits is 442368, while the sum is 48.

The square root of 31868688 is about 5645.2358675258. The cubic root of 31868688 is about 317.0453550260.

It can be divided in two parts, 318 and 68688, that added together give a triangular number (69006 = T₃₇₁).

The spelling of 31868688 in words is "thirty-one million, eight hundred sixty-eight thousand, six hundred eighty-eight".