643334 has 8 divisors (see below), whose sum is σ = 979608. Its totient is φ = 316800.

The previous prime is 643303. The next prime is 643369. The reversal of 643334 is 433346.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

643334 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2267 + ... + 2534.

It is an arithmetic number, because the mean of its divisors is an integer number (122451).

2⁶⁴³³³⁴ is an apocalyptic number.

643334 is a deficient number, since it is larger than the sum of its proper divisors (336274).

643334 is a wasteful number, since it uses less digits than its factorization.

643334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4870.

The product of its digits is 2592, while the sum is 23.

The square root of 643334 is about 802.0810432868. The cubic root of 643334 is about 86.3267719439.

The spelling of 643334 in words is "six hundred forty-three thousand, three hundred thirty-four".