640004204 has 12 divisors (see below), whose sum is σ = 1280008464. Its totient is φ = 274287504.

The previous prime is 640004191. The next prime is 640004221. The reversal of 640004204 is 402400046.

640004204 is an admirable number.

It is a super-2 number, since 2×640004204² = 819210762275347232, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 11428619 + ... + 11428674.

It is an arithmetic number, because the mean of its divisors is an integer number (106667372).

Almost surely, 2^640004204 is an apocalyptic number.

It is an amenable number.

640004204 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640004204 is a wasteful number, since it uses less digits than its factorization.

640004204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22857304 (or 22857302 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 640004204 is about 25298.3043700561. The cubic root of 640004204 is about 861.7757629343.

The spelling of 640004204 in words is "six hundred forty million, four thousand, two hundred four".