643474052 has 24 divisors (see below), whose sum is σ = 1213396800. Its totient is φ = 296817696.

The previous prime is 643474043. The next prime is 643474079. The reversal of 643474052 is 250474346.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158099 + ... + 162117.

It is an arithmetic number, because the mean of its divisors is an integer number (50558200).

Almost surely, 2^643474052 is an apocalyptic number.

It is an amenable number.

643474052 is a deficient number, since it is larger than the sum of its proper divisors (569922748).

643474052 is a wasteful number, since it uses less digits than its factorization.

643474052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7115 (or 7113 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 35.

The square root of 643474052 is about 25366.7903369740. The cubic root of 643474052 is about 863.3303585447.

The spelling of 643474052 in words is "six hundred forty-three million, four hundred seventy-four thousand, fifty-two".