31887436656 has 80 divisors (see below), whose sum is σ = 87249549600. Its totient is φ = 10000687104.

The previous prime is 31887436619. The next prime is 31887436663. The reversal of 31887436656 is 65663478813.

It is a junction number, because it is equal to n+sod(n) for n = 31887436596 and 31887436605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4638790 + ... + 4645658.

It is an arithmetic number, because the mean of its divisors is an integer number (1090619370).

Almost surely, 2^31887436656 is an apocalyptic number.

It is an amenable number.

31887436656 is an abundant number, since it is smaller than the sum of its proper divisors (55362112944).

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

31887436656 is a wasteful number, since it uses less digits than its factorization.

31887436656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12586 (or 12580 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 57.

The spelling of 31887436656 in words is "thirty-one billion, eight hundred eighty-seven million, four hundred thirty-six thousand, six hundred fifty-six".