643238304 has 24 divisors (see below), whose sum is σ = 1688500800. Its totient is φ = 214412736.

The previous prime is 643238273. The next prime is 643238339. The reversal of 643238304 is 403832346.

It is a tau number, because it is divible by the number of its divisors (24).

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, 3350104 + ... + 3350295.

It is an arithmetic number, because the mean of its divisors is an integer number (70354200).

Almost surely, 2^643238304 is an apocalyptic number.

It is an amenable number.

643238304 is an abundant number, since it is smaller than the sum of its proper divisors (1045262496).

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

643238304 is a wasteful number, since it uses less digits than its factorization.

643238304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700412 (or 6700404 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 33.

The square root of 643238304 is about 25362.1431271097. The cubic root of 643238304 is about 863.2249135956.

It can be divided in two parts, 64323 and 8304, that added together give a palindrome (72627).

The spelling of 643238304 in words is "six hundred forty-three million, two hundred thirty-eight thousand, three hundred four".