640564313 has 8 divisors (see below), whose sum is σ = 664267968. Its totient is φ = 617197104.

The previous prime is 640564303. The next prime is 640564319. The reversal of 640564313 is 313465046.

640564313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640564313 - 2⁴ = 640564297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640564313.

It is not an unprimeable number, because it can be changed into a prime (640564319) 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, 80231 + ... + 87852.

It is an arithmetic number, because the mean of its divisors is an integer number (83033496).

Almost surely, 2^640564313 is an apocalyptic number.

It is an amenable number.

640564313 is a deficient number, since it is larger than the sum of its proper divisors (23703655).

640564313 is a wasteful number, since it uses less digits than its factorization.

640564313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168223.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 640564313 is about 25309.3720388318. The cubic root of 640564313 is about 862.0270881682.

The spelling of 640564313 in words is "six hundred forty million, five hundred sixty-four thousand, three hundred thirteen".