317728 has 12 divisors (see below), whose sum is σ = 625590. Its totient is φ = 158848.

The previous prime is 317717. The next prime is 317729. The reversal of 317728 is 827713.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 300304 + 17424 = 548^2 + 132^2 .

It is a junction number, because it is equal to n+sod(n) for n = 317696 and 317705.

It is not an unprimeable number, because it can be changed into a prime (317729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4933 + ... + 4996.

2³¹⁷⁷²⁸ is an apocalyptic number.

It is an amenable number.

317728 is a deficient number, since it is larger than the sum of its proper divisors (307862).

317728 is an equidigital number, since it uses as much as digits as its factorization.

317728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9939 (or 9931 counting only the distinct ones).

The product of its digits is 2352, while the sum is 28.

The square root of 317728 is about 563.6736644549. The cubic root of 317728 is about 68.2367755152.

The spelling of 317728 in words is "three hundred seventeen thousand, seven hundred twenty-eight".