643223564 has 12 divisors (see below), whose sum is σ = 1127034888. Its totient is φ = 321213600.

The previous prime is 643223563. The next prime is 643223599. The reversal of 643223564 is 465322346.

It is not an unprimeable number, because it can be changed into a prime (643223563) 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, 95897 + ... + 102384.

It is an arithmetic number, because the mean of its divisors is an integer number (93919574).

Almost surely, 2^643223564 is an apocalyptic number.

It is an amenable number.

643223564 is a deficient number, since it is larger than the sum of its proper divisors (483811324).

643223564 is a wasteful number, since it uses less digits than its factorization.

643223564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199096 (or 199094 counting only the distinct ones).

The product of its digits is 103680, while the sum is 35.

The square root of 643223564 is about 25361.8525348603. The cubic root of 643223564 is about 863.2183198587.

The spelling of 643223564 in words is "six hundred forty-three million, two hundred twenty-three thousand, five hundred sixty-four".