317998640 has 40 divisors (see below), whose sum is σ = 744691920. Its totient is φ = 126279936.

The previous prime is 317998627. The next prime is 317998643. The reversal of 317998640 is 46899713.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×317998640² = 202246270083699200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (317998643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3179 + ... + 25418.

It is an arithmetic number, because the mean of its divisors is an integer number (18617298).

Almost surely, 2^317998640 is an apocalyptic number.

It is an amenable number.

317998640 is an abundant number, since it is smaller than the sum of its proper divisors (426693280).

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

317998640 is a wasteful number, since it uses less digits than its factorization.

317998640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28749 (or 28743 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 317998640 is about 17832.5163675798. The cubic root of 317998640 is about 682.5614466094.

The spelling of 317998640 in words is "three hundred seventeen million, nine hundred ninety-eight thousand, six hundred forty".