641504 has 12 divisors (see below), whose sum is σ = 1263024. Its totient is φ = 320736.

The previous prime is 641491. The next prime is 641513. The reversal of 641504 is 405146.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

641504 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9992 + ... + 10055.

It is an arithmetic number, because the mean of its divisors is an integer number (105252).

2⁶⁴¹⁵⁰⁴ is an apocalyptic number.

It is an amenable number.

641504 is a deficient number, since it is larger than the sum of its proper divisors (621520).

641504 is a wasteful number, since it uses less digits than its factorization.

641504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20057 (or 20049 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 641504 is about 800.9394483979. The cubic root of 641504 is about 86.2448404111.

The spelling of 641504 in words is "six hundred forty-one thousand, five hundred four".