640108375 has 16 divisors (see below), whose sum is σ = 802900800. Its totient is φ = 509493600.

The previous prime is 640108351. The next prime is 640108409. The reversal of 640108375 is 573801046.

It is not a de Polignac number, because 640108375 - 2⁹ = 640107863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640108375.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12009 + ... + 37741.

It is an arithmetic number, because the mean of its divisors is an integer number (50181300).

Almost surely, 2^640108375 is an apocalyptic number.

640108375 is a deficient number, since it is larger than the sum of its proper divisors (162792425).

640108375 is a wasteful number, since it uses less digits than its factorization.

640108375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25947 (or 25937 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 640108375 is about 25300.3631396864. The cubic root of 640108375 is about 861.8225163631.

The spelling of 640108375 in words is "six hundred forty million, one hundred eight thousand, three hundred seventy-five".