317990820 has 96 divisors (see below), whose sum is σ = 1020837888. Its totient is φ = 72450432.

The previous prime is 317990809. The next prime is 317990851. The reversal of 317990820 is 28099713.

It is a super-2 number, since 2×317990820² = 202236323208544800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153109 + ... + 155171.

It is an arithmetic number, because the mean of its divisors is an integer number (10633728).

Almost surely, 2^317990820 is an apocalyptic number.

317990820 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 317990820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (510418944).

317990820 is an abundant number, since it is smaller than the sum of its proper divisors (702847068).

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

317990820 is a wasteful number, since it uses less digits than its factorization.

317990820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449 (or 2447 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 317990820 is about 17832.2971038506. The cubic root of 317990820 is about 682.5558515390. Note that the first 3 decimals are identical.

The spelling of 317990820 in words is "three hundred seventeen million, nine hundred ninety thousand, eight hundred twenty".