31693751604 has 120 divisors (see below), whose sum is σ = 85634329088. Its totient is φ = 10210898880.

The previous prime is 31693751603. The next prime is 31693751611. The reversal of 31693751604 is 40615739613.

It is a happy number.

31693751604 is a `hidden beast` number, since 3 + 1 + 6 + 9 + 37 + 5 + 1 + 604 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 31693751604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31693751603) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10976649 + ... + 10979535.

Almost surely, 2^31693751604 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 31693751604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42817164544).

31693751604 is an abundant number, since it is smaller than the sum of its proper divisors (53940577484).

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

31693751604 is a wasteful number, since it uses less digits than its factorization.

31693751604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4027 (or 4016 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 31693751604 in words is "thirty-one billion, six hundred ninety-three million, seven hundred fifty-one thousand, six hundred four".