643434304 has 28 divisors (see below), whose sum is σ = 1279131300. Its totient is φ = 321133568.

The previous prime is 643434293. The next prime is 643434331. The reversal of 643434304 is 403434346.

It can be written as a sum of positive squares in 2 ways, for example, as 116640000 + 526794304 = 10800^2 + 22952^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27582 + ... + 45250.

Almost surely, 2^643434304 is an apocalyptic number.

643434304 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

643434304 is a deficient number, since it is larger than the sum of its proper divisors (635696996).

643434304 is a wasteful number, since it uses less digits than its factorization.

643434304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18250 (or 18240 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 31.

The square root of 643434304 is about 25366.0068595749. The cubic root of 643434304 is about 863.3125819347.

The spelling of 643434304 in words is "six hundred forty-three million, four hundred thirty-four thousand, three hundred four".