643550604 has 12 divisors (see below), whose sum is σ = 1501618104. Its totient is φ = 214516864.

The previous prime is 643550591. The next prime is 643550627. The reversal of 643550604 is 406055346.

It is a tau number, because it is divible by the number of its divisors (12).

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, 26814597 + ... + 26814620.

It is an arithmetic number, because the mean of its divisors is an integer number (125134842).

Almost surely, 2^643550604 is an apocalyptic number.

It is an amenable number.

643550604 is an abundant number, since it is smaller than the sum of its proper divisors (858067500).

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

643550604 is a wasteful number, since it uses less digits than its factorization.

643550604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53629224 (or 53629222 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 643550604 is about 25368.2991940729. The cubic root of 643550604 is about 863.3645930486.

The spelling of 643550604 in words is "six hundred forty-three million, five hundred fifty thousand, six hundred four".