643224904 has 16 divisors (see below), whose sum is σ = 1378339200. Its totient is φ = 275667792.

The previous prime is 643224889. The next prime is 643224913. The reversal of 643224904 is 409422346.

It is a self number, because there is not a number n which added to its sum of digits gives 643224904.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5743024 + ... + 5743135.

It is an arithmetic number, because the mean of its divisors is an integer number (86146200).

Almost surely, 2^643224904 is an apocalyptic number.

It is an amenable number.

643224904 is an abundant number, since it is smaller than the sum of its proper divisors (735114296).

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

643224904 is a wasteful number, since it uses less digits than its factorization.

643224904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11486172 (or 11486168 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 643224904 is about 25361.8789524751. The cubic root of 643224904 is about 863.2189192935.

The spelling of 643224904 in words is "six hundred forty-three million, two hundred twenty-four thousand, nine hundred four".