641604975 has 48 divisors (see below), whose sum is σ = 1188554880. Its totient is φ = 302659200.

The previous prime is 641604937. The next prime is 641604979. The reversal of 641604975 is 579406146.

It is not a de Polignac number, because 641604975 - 2⁶ = 641604911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641604979) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20016 + ... + 41034.

It is an arithmetic number, because the mean of its divisors is an integer number (24761560).

Almost surely, 2^641604975 is an apocalyptic number.

641604975 is a deficient number, since it is larger than the sum of its proper divisors (546949905).

641604975 is a wasteful number, since it uses less digits than its factorization.

641604975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21080 (or 21075 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 641604975 is about 25329.9225225819. The cubic root of 641604975 is about 862.4936525473.

The spelling of 641604975 in words is "six hundred forty-one million, six hundred four thousand, nine hundred seventy-five".