640928075 has 24 divisors (see below), whose sum is σ = 807240000. Its totient is φ = 504732960.

The previous prime is 640928063. The next prime is 640928089. The reversal of 640928075 is 570829046.

640928075 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640928075 - 2⁶ = 640928011 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1035116 + ... + 1035734.

It is an arithmetic number, because the mean of its divisors is an integer number (33635000).

Almost surely, 2^640928075 is an apocalyptic number.

640928075 is a deficient number, since it is larger than the sum of its proper divisors (166311925).

640928075 is a wasteful number, since it uses less digits than its factorization.

640928075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1206 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 640928075 is about 25316.5573291473. The cubic root of 640928075 is about 862.1902325254.

The spelling of 640928075 in words is "six hundred forty million, nine hundred twenty-eight thousand, seventy-five".