640568200 has 24 divisors (see below), whose sum is σ = 1489321530. Its totient is φ = 256227200.

The previous prime is 640568191. The next prime is 640568207. The reversal of 640568200 is 2865046.

It can be written as a sum of positive squares in 3 ways, for example, as 581677924 + 58890276 = 24118^2 + 7674^2 .

It is not an unprimeable number, because it can be changed into a prime (640568207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1601221 + ... + 1601620.

Almost surely, 2^640568200 is an apocalyptic number.

It is an amenable number.

640568200 is an abundant number, since it is smaller than the sum of its proper divisors (848753330).

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

640568200 is a wasteful number, since it uses less digits than its factorization.

640568200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202857 (or 3202848 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 640568200 is about 25309.4488284514. The cubic root of 640568200 is about 862.0288317831.

The spelling of 640568200 in words is "six hundred forty million, five hundred sixty-eight thousand, two hundred".