643503234 has 16 divisors (see below), whose sum is σ = 1404007200. Its totient is φ = 195000960.

The previous prime is 643503221. The next prime is 643503253. The reversal of 643503234 is 432305346.

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, 4874959 + ... + 4875090.

It is an arithmetic number, because the mean of its divisors is an integer number (87750450).

Almost surely, 2^643503234 is an apocalyptic number.

643503234 is an abundant number, since it is smaller than the sum of its proper divisors (760503966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643503234 is a wasteful number, since it uses less digits than its factorization.

643503234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9750065.

The product of its (nonzero) digits is 25920, while the sum is 30.

The square root of 643503234 is about 25367.3655313278. The cubic root of 643503234 is about 863.3434092267.

The spelling of 643503234 in words is "six hundred forty-three million, five hundred three thousand, two hundred thirty-four".