643280032 has 24 divisors (see below), whose sum is σ = 1267207200. Its totient is φ = 321449664.

The previous prime is 643280021. The next prime is 643280089. The reversal of 643280032 is 230082346.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60319 + ... + 70177.

It is an arithmetic number, because the mean of its divisors is an integer number (52800300).

Almost surely, 2^643280032 is an apocalyptic number.

It is an amenable number.

643280032 is a deficient number, since it is larger than the sum of its proper divisors (623927168).

643280032 is a wasteful number, since it uses less digits than its factorization.

643280032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11908 (or 11900 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 643280032 is about 25362.9657571823. The cubic root of 643280032 is about 863.2435794981.

The spelling of 643280032 in words is "six hundred forty-three million, two hundred eighty thousand, thirty-two".