640142564 has 12 divisors (see below), whose sum is σ = 1122063600. Its totient is φ = 319552968.

The previous prime is 640142551. The next prime is 640142579. The reversal of 640142564 is 465241046.

640142564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 640142564.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126794 + ... + 131745.

It is an arithmetic number, because the mean of its divisors is an integer number (93505300).

Almost surely, 2^640142564 is an apocalyptic number.

It is an amenable number.

640142564 is a deficient number, since it is larger than the sum of its proper divisors (481921036).

640142564 is a wasteful number, since it uses less digits than its factorization.

640142564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259162 (or 259160 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 640142564 is about 25301.0387929033. The cubic root of 640142564 is about 861.8378597677.

The spelling of 640142564 in words is "six hundred forty million, one hundred forty-two thousand, five hundred sixty-four".