640910204 has 24 divisors (see below), whose sum is σ = 1287955200. Its totient is φ = 275989680.

The previous prime is 640910197. The next prime is 640910209. The reversal of 640910204 is 402019046.

640910204 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640910209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382484 + ... + 384155.

It is an arithmetic number, because the mean of its divisors is an integer number (53664800).

Almost surely, 2^640910204 is an apocalyptic number.

It is an amenable number.

640910204 is an abundant number, since it is smaller than the sum of its proper divisors (647044996).

640910204 is a wasteful number, since it uses less digits than its factorization.

640910204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766673 (or 766671 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 640910204 is about 25316.2043758538. The cubic root of 640910204 is about 862.1822189664.

The spelling of 640910204 in words is "six hundred forty million, nine hundred ten thousand, two hundred four".