643475564 has 24 divisors (see below), whose sum is σ = 1154881728. Its totient is φ = 313543440.

The previous prime is 643475563. The next prime is 643475579. The reversal of 643475564 is 465574346.

It is not an unprimeable number, because it can be changed into a prime (643475563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76319 + ... + 84329.

It is an arithmetic number, because the mean of its divisors is an integer number (48120072).

Almost surely, 2^643475564 is an apocalyptic number.

It is an amenable number.

643475564 is a deficient number, since it is larger than the sum of its proper divisors (511406164).

643475564 is a wasteful number, since it uses less digits than its factorization.

643475564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8525 (or 8523 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 44.

The square root of 643475564 is about 25366.8201397022. The cubic root of 643475564 is about 863.3310347462.

The spelling of 643475564 in words is "six hundred forty-three million, four hundred seventy-five thousand, five hundred sixty-four".