643722604 has 36 divisors (see below), whose sum is σ = 1313300520. Its totient is φ = 275278080.

The previous prime is 643722601. The next prime is 643722619. The reversal of 643722604 is 406227346.

It is a self number, because there is not a number n which added to its sum of digits gives 643722604.

It is not an unprimeable number, because it can be changed into a prime (643722601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92892 + ... + 99580.

It is an arithmetic number, because the mean of its divisors is an integer number (36480570).

Almost surely, 2^643722604 is an apocalyptic number.

It is an amenable number.

643722604 is an abundant number, since it is smaller than the sum of its proper divisors (669577916).

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

643722604 is a wasteful number, since it uses less digits than its factorization.

643722604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7198 (or 7189 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 643722604 is about 25371.6890253684. The cubic root of 643722604 is about 863.4415025573.

The spelling of 643722604 in words is "six hundred forty-three million, seven hundred twenty-two thousand, six hundred four".