640854375 has 80 divisors (see below), whose sum is σ = 1232005632. Its totient is φ = 290160000.

The previous prime is 640854337. The next prime is 640854407. The reversal of 640854375 is 573458046.

640854375 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 640854375 - 2⁶ = 640854311 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2060470 + ... + 2060780.

Almost surely, 2^640854375 is an apocalyptic number.

640854375 is a deficient number, since it is larger than the sum of its proper divisors (591151257).

640854375 is a wasteful number, since it uses less digits than its factorization.

640854375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 42.

The square root of 640854375 is about 25315.1017181444. The cubic root of 640854375 is about 862.1571836502.

The spelling of 640854375 in words is "six hundred forty million, eight hundred fifty-four thousand, three hundred seventy-five".