641644604 has 24 divisors (see below), whose sum is σ = 1180653600. Its totient is φ = 304678080.

The previous prime is 641644579. The next prime is 641644609. The reversal of 641644604 is 406446146.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641644609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38264 + ... + 52415.

It is an arithmetic number, because the mean of its divisors is an integer number (49193900).

Almost surely, 2^641644604 is an apocalyptic number.

It is an amenable number.

641644604 is a deficient number, since it is larger than the sum of its proper divisors (539008996).

641644604 is a wasteful number, since it uses less digits than its factorization.

641644604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90773 (or 90771 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 641644604 is about 25330.7047671398. The cubic root of 641644604 is about 862.5114096089.

The spelling of 641644604 in words is "six hundred forty-one million, six hundred forty-four thousand, six hundred four".