640134564 has 12 divisors (see below), whose sum is σ = 1493647344. Its totient is φ = 213378184.

The previous prime is 640134563. The next prime is 640134569. The reversal of 640134564 is 465431046.

640134564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (640134563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26672262 + ... + 26672285.

It is an arithmetic number, because the mean of its divisors is an integer number (124470612).

Almost surely, 2^640134564 is an apocalyptic number.

It is an amenable number.

640134564 is an abundant number, since it is smaller than the sum of its proper divisors (853512780).

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

640134564 is a wasteful number, since it uses less digits than its factorization.

640134564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53344554 (or 53344552 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 640134564 is about 25300.8806961339. The cubic root of 640134564 is about 861.8342695614.

The spelling of 640134564 in words is "six hundred forty million, one hundred thirty-four thousand, five hundred sixty-four".