643304 has 16 divisors (see below), whose sum is σ = 1220100. Its totient is φ = 317952.

The previous prime is 643303. The next prime is 643369. The reversal of 643304 is 403346.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 643204 + 100 = 802^2 + 10^2 .

It is not an unprimeable number, because it can be changed into a prime (643301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362 + ... + 1190.

2⁶⁴³³⁰⁴ is an apocalyptic number.

It is an amenable number.

643304 is a deficient number, since it is larger than the sum of its proper divisors (576796).

643304 is a wasteful number, since it uses less digits than its factorization.

643304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932 (or 928 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 643304 is about 802.0623417167. The cubic root of 643304 is about 86.3254300576.

The spelling of 643304 in words is "six hundred forty-three thousand, three hundred four".