317720640 has 112 divisors (see below), whose sum is σ = 1016447040. Its totient is φ = 84080640.

The previous prime is 317720629. The next prime is 317720651. The reversal of 317720640 is 46027713.

It is an interprime number because it is at equal distance from previous prime (317720629) and next prime (317720651).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 317720598 and 317720607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132250 + ... + 134630.

It is an arithmetic number, because the mean of its divisors is an integer number (9075420).

Almost surely, 2^317720640 is an apocalyptic number.

317720640 is a gapful number since it is divisible by the number (30) 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 317720640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (508223520).

317720640 is an abundant number, since it is smaller than the sum of its proper divisors (698726400).

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

317720640 is a wasteful number, since it uses less digits than its factorization.

317720640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540 (or 2530 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 317720640 is about 17824.7199136480. The cubic root of 317720640 is about 682.3624862156.

The spelling of 317720640 in words is "three hundred seventeen million, seven hundred twenty thousand, six hundred forty".