641604 has 24 divisors (see below), whose sum is σ = 1512448. Its totient is φ = 211680.

The previous prime is 641581. The next prime is 641623. The reversal of 641604 is 406146.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1314 + ... + 1734.

2⁶⁴¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

641604 is an abundant number, since it is smaller than the sum of its proper divisors (870844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641604 is a wasteful number, since it uses less digits than its factorization.

641604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555 (or 553 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 641604 is about 801.0018726570. The cubic root of 641604 is about 86.2493215658.

The spelling of 641604 in words is "six hundred forty-one thousand, six hundred four".