643435346 has 8 divisors (see below), whose sum is σ = 1021926780. Its totient is φ = 302793088.

The previous prime is 643435343. The next prime is 643435417. The reversal of 643435346 is 643534346.

It can be written as a sum of positive squares in 2 ways, for example, as 643180321 + 255025 = 25361^2 + 505^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (643435343) by changing a digit.

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, 9462251 + ... + 9462318.

Almost surely, 2^643435346 is an apocalyptic number.

643435346 is a deficient number, since it is larger than the sum of its proper divisors (378491434).

643435346 is a wasteful number, since it uses less digits than its factorization.

643435346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18924588.

The product of its digits is 311040, while the sum is 38.

The square root of 643435346 is about 25366.0273988656. The cubic root of 643435346 is about 863.3130479607.

The spelling of 643435346 in words is "six hundred forty-three million, four hundred thirty-five thousand, three hundred forty-six".