316721664 has 200 divisors, whose sum is σ = 1081368288. Its totient is φ = 90408960.

The previous prime is 316721641. The next prime is 316721677. The reversal of 316721664 is 466127613.

It is a happy number.

It is a super-2 number, since 2×316721664² = 200625224893857792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 289759 + ... + 290849.

Almost surely, 2^316721664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 316721664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (540684144).

316721664 is an abundant number, since it is smaller than the sum of its proper divisors (764646624).

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

316721664 is an equidigital number, since it uses as much as digits as its factorization.

316721664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128 (or 1103 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 316721664 is about 17796.6756446253. The cubic root of 316721664 is about 681.6465748773.

The spelling of 316721664 in words is "three hundred sixteen million, seven hundred twenty-one thousand, six hundred sixty-four".