317981568 has 128 divisors (see below), whose sum is σ = 911635200. Its totient is φ = 97873920.

The previous prime is 317981563. The next prime is 317981579. The reversal of 317981568 is 865189713.

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

It is a super-2 number, since 2×317981568² = 202224555175477248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317981561) 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, 298605 + ... + 299667.

It is an arithmetic number, because the mean of its divisors is an integer number (7122150).

Almost surely, 2^317981568 is an apocalyptic number.

317981568 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 317981568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (455817600).

317981568 is an abundant number, since it is smaller than the sum of its proper divisors (593653632).

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

317981568 is a wasteful number, since it uses less digits than its factorization.

317981568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140 (or 1128 counting only the distinct ones).

The product of its digits is 362880, while the sum is 48.

The square root of 317981568 is about 17832.0376850207. The cubic root of 317981568 is about 682.5492317798.

The spelling of 317981568 in words is "three hundred seventeen million, nine hundred eighty-one thousand, five hundred sixty-eight".