643255504 has 30 divisors (see below), whose sum is σ = 1254744530. Its totient is φ = 319459008.

The previous prime is 643255493. The next prime is 643255531. The reversal of 643255504 is 405552346.

It can be written as a sum of positive squares in only one way, i.e., 632019600 + 11235904 = 25140^2 + 3352^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 643255504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1535007 + ... + 1535425.

Almost surely, 2^643255504 is an apocalyptic number.

It is an amenable number.

643255504 is a deficient number, since it is larger than the sum of its proper divisors (611489026).

643255504 is an equidigital number, since it uses as much as digits as its factorization.

643255504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

The square root of 643255504 is about 25362.4822129065. The cubic root of 643255504 is about 863.2326076525.

The spelling of 643255504 in words is "six hundred forty-three million, two hundred fifty-five thousand, five hundred four".