643444346 has 8 divisors (see below), whose sum is σ = 987612384. Its totient is φ = 314240220.

The previous prime is 643444267. The next prime is 643444363.

643444346 is nontrivially palindromic in base 10.

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

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, 3740870 + ... + 3741041.

It is an arithmetic number, because the mean of its divisors is an integer number (123451548).

Almost surely, 2^643444346 is an apocalyptic number.

643444346 is a deficient number, since it is larger than the sum of its proper divisors (344168038).

643444346 is a wasteful number, since it uses less digits than its factorization.

643444346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7481956.

The product of its digits is 331776, while the sum is 38.

The square root of 643444346 is about 25366.2048008763. The cubic root of 643444346 is about 863.3170731158.

The spelling of 643444346 in words is "six hundred forty-three million, four hundred forty-four thousand, three hundred forty-six".