317975489920 has 128 divisors (see below), whose sum is σ = 851678906400. Its totient is φ = 112502292480.

The previous prime is 317975489863. The next prime is 317975489921. The reversal of 317975489920 is 29984579713.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×317975489920² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317975489921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349885 + ... + 870844.

Almost surely, 2^317975489920 is an apocalyptic number.

It is an amenable number.

317975489920 is an abundant number, since it is smaller than the sum of its proper divisors (533703416480).

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

317975489920 is a wasteful number, since it uses less digits than its factorization.

317975489920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220796 (or 1220784 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 64.

The spelling of 317975489920 in words is "three hundred seventeen billion, nine hundred seventy-five million, four hundred eighty-nine thousand, nine hundred twenty".