643506602 has 16 divisors (see below), whose sum is σ = 984379392. Its totient is φ = 315391440.

The previous prime is 643506601. The next prime is 643506631. The reversal of 643506602 is 206605346.

It is not an unprimeable number, because it can be changed into a prime (643506601) 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, 153863 + ... + 157989.

It is an arithmetic number, because the mean of its divisors is an integer number (61523712).

Almost surely, 2^643506602 is an apocalyptic number.

643506602 is a deficient number, since it is larger than the sum of its proper divisors (340872790).

643506602 is a wasteful number, since it uses less digits than its factorization.

643506602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5653.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 643506602 is about 25367.4319157458. The cubic root of 643506602 is about 863.3449154276.

The spelling of 643506602 in words is "six hundred forty-three million, five hundred six thousand, six hundred two".