643533346 has 8 divisors (see below), whose sum is σ = 965672640. Its totient is φ = 321642468.

The previous prime is 643533337. The next prime is 643533377. The reversal of 643533346 is 643335346.

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

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, 55486 + ... + 66073.

It is an arithmetic number, because the mean of its divisors is an integer number (120709080).

Almost surely, 2^643533346 is an apocalyptic number.

643533346 is a deficient number, since it is larger than the sum of its proper divisors (322139294).

643533346 is a wasteful number, since it uses less digits than its factorization.

643533346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124208.

The product of its digits is 233280, while the sum is 37.

The square root of 643533346 is about 25367.9590428556. The cubic root of 643533346 is about 863.3568754067.

The spelling of 643533346 in words is "six hundred forty-three million, five hundred thirty-three thousand, three hundred forty-six".