643433432 has 16 divisors (see below), whose sum is σ = 1206882600. Its totient is φ = 321598080.

The previous prime is 643433419. The next prime is 643433447. The reversal of 643433432 is 234334346.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10832 + ... + 37472.

Almost surely, 2^643433432 is an apocalyptic number.

It is an amenable number.

643433432 is a deficient number, since it is larger than the sum of its proper divisors (563449168).

643433432 is a wasteful number, since it uses less digits than its factorization.

643433432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29666 (or 29662 counting only the distinct ones).

The product of its digits is 62208, while the sum is 32.

The square root of 643433432 is about 25365.9896712113. The cubic root of 643433432 is about 863.3121919395.

Adding to 643433432 its reverse (234334346), we get a palindrome (877767778).

The spelling of 643433432 in words is "six hundred forty-three million, four hundred thirty-three thousand, four hundred thirty-two".