31856478663132 has 384 divisors, whose sum is σ = 90731588935680. Its totient is φ = 9622477762560.

The previous prime is 31856478663083. The next prime is 31856478663137. The reversal of 31856478663132 is 23136687465813.

31856478663132 is a `hidden beast` number, since 3 + 1 + 8 + 564 + 7 + 8 + 6 + 6 + 31 + 32 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 31856478663132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31856478663137) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11829363178 + ... + 11829365870.

It is an arithmetic number, because the mean of its divisors is an integer number (236280179520).

Almost surely, 2^{31856478663132} 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 31856478663132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45365794467840).

31856478663132 is an abundant number, since it is smaller than the sum of its proper divisors (58875110272548).

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

31856478663132 is a wasteful number, since it uses less digits than its factorization.

31856478663132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3738 (or 3730 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 63.

The spelling of 31856478663132 in words is "thirty-one trillion, eight hundred fifty-six billion, four hundred seventy-eight million, six hundred sixty-three thousand, one hundred thirty-two".