640819002 has 16 divisors (see below), whose sum is σ = 1286268192. Its totient is φ = 212834640.

The previous prime is 640818977. The next prime is 640819033. The reversal of 640819002 is 200918046.

640819002 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191124 + ... + 194447.

It is an arithmetic number, because the mean of its divisors is an integer number (80391762).

Almost surely, 2^640819002 is an apocalyptic number.

640819002 is an abundant number, since it is smaller than the sum of its proper divisors (645449190).

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

640819002 is a wasteful number, since it uses less digits than its factorization.

640819002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385853.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 640819002 is about 25314.4030543878. The cubic root of 640819002 is about 862.1413206355.

The spelling of 640819002 in words is "six hundred forty million, eight hundred nineteen thousand, two".