31983747895872 has 42 divisors (see below), whose sum is σ = 91675638501798. Its totient is φ = 10661249298432.

The previous prime is 31983747895849. The next prime is 31983747895921. The reversal of 31983747895872 is 27859874738913.

It is a happy number.

31983747895872 is a `hidden beast` number, since 3 + 1 + 98 + 3 + 7 + 478 + 9 + 58 + 7 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 26589946023936 + 5393801871936 = 5156544^2 + 2322456^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31983747895791 and 31983747895800.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27763669473 + ... + 27763670624.

Almost surely, 2^{31983747895872} is an apocalyptic number.

31983747895872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31983747895872 is an abundant number, since it is smaller than the sum of its proper divisors (59691890605926).

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

31983747895872 is a wasteful number, since it uses less digits than its factorization.

31983747895872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55527340115 (or 55527340102 counting only the distinct ones).

The product of its digits is 5120962560, while the sum is 81.

The spelling of 31983747895872 in words is "thirty-one trillion, nine hundred eighty-three billion, seven hundred forty-seven million, eight hundred ninety-five thousand, eight hundred seventy-two".