31717428920 has 16 divisors (see below), whose sum is σ = 71364215160. Its totient is φ = 12686971552.

The previous prime is 31717428901. The next prime is 31717428937. The reversal of 31717428920 is 2982471713.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396467822 + ... + 396467901.

Almost surely, 2^31717428920 is an apocalyptic number.

It is an amenable number.

31717428920 is an abundant number, since it is smaller than the sum of its proper divisors (39646786240).

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

31717428920 is a wasteful number, since it uses less digits than its factorization.

31717428920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792935734 (or 792935730 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 31717428920 in words is "thirty-one billion, seven hundred seventeen million, four hundred twenty-eight thousand, nine hundred twenty".