31917784009904 has 20 divisors (see below), whose sum is σ = 66597683944176. Its totient is φ = 14731284927552.

The previous prime is 31917784009897. The next prime is 31917784009921. The reversal of 31917784009904 is 40990048771913.

It is a super-2 number, since 2×31917784009904² (a number of 28 digits) contains 22 as substring.

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, 76725442124 + ... + 76725442539.

Almost surely, 2^{31917784009904} is an apocalyptic number.

It is an amenable number.

31917784009904 is an abundant number, since it is smaller than the sum of its proper divisors (34679899934272).

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

31917784009904 is a wasteful number, since it uses less digits than its factorization.

31917784009904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153450884684 (or 153450884678 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 62.

The spelling of 31917784009904 in words is "thirty-one trillion, nine hundred seventeen billion, seven hundred eighty-four million, nine thousand, nine hundred four".