31607561688 has 64 divisors (see below), whose sum is σ = 81273573120. Its totient is φ = 10236067200.

The previous prime is 31607561669. The next prime is 31607561747. The reversal of 31607561688 is 88616570613.

It is a self number, because there is not a number n which added to its sum of digits gives 31607561688.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 587853 + ... + 639363.

It is an arithmetic number, because the mean of its divisors is an integer number (1269899580).

Almost surely, 2^31607561688 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 31607561688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40636786560).

31607561688 is an abundant number, since it is smaller than the sum of its proper divisors (49666011432).

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

31607561688 is a wasteful number, since it uses less digits than its factorization.

31607561688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52248 (or 52244 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 31607561688 in words is "thirty-one billion, six hundred seven million, five hundred sixty-one thousand, six hundred eighty-eight".