31688506368 has 264 divisors, whose sum is σ = 95421510912. Its totient is φ = 10503696384.

The previous prime is 31688506319. The next prime is 31688506453. The reversal of 31688506368 is 86360588613.

It is a super-2 number, since 2×31688506368² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86344521 + ... + 86344887.

Almost surely, 2^31688506368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31688506368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47710755456).

31688506368 is an abundant number, since it is smaller than the sum of its proper divisors (63733004544).

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

31688506368 is an equidigital number, since it uses as much as digits as its factorization.

31688506368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 31688506368 in words is "thirty-one billion, six hundred eighty-eight million, five hundred six thousand, three hundred sixty-eight".