664682256 has 90 divisors (see below), whose sum is σ = 2163914142. Its totient is φ = 189907200.

The previous prime is 664682243. The next prime is 664682281. The reversal of 664682256 is 652286466.

It can be written as a sum of positive squares in only one way, i.e., 639280656 + 25401600 = 25284^2 + 5040^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40045 + ... + 54156.

Almost surely, 2^664682256 is an apocalyptic number.

It is an amenable number.

664682256 is an abundant number, since it is smaller than the sum of its proper divisors (1499231886).

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

664682256 is a wasteful number, since it uses less digits than its factorization.

664682256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94229 (or 94213 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 664682256 is about 25781.4323884458. The cubic root of 664682256 is about 872.7128321001.

The spelling of 664682256 in words is "six hundred sixty-four million, six hundred eighty-two thousand, two hundred fifty-six".