643299329 has 8 divisors (see below), whose sum is σ = 684948960. Its totient is φ = 602072896.

The previous prime is 643299277. The next prime is 643299341. The reversal of 643299329 is 923992346.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643299329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643295329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102659 + ... + 108744.

It is an arithmetic number, because the mean of its divisors is an integer number (85618620).

Almost surely, 2^643299329 is an apocalyptic number.

It is an amenable number.

643299329 is a deficient number, since it is larger than the sum of its proper divisors (41649631).

643299329 is a wasteful number, since it uses less digits than its factorization.

643299329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211599.

The product of its digits is 629856, while the sum is 47.

The square root of 643299329 is about 25363.3461711975. The cubic root of 643299329 is about 863.2522112209.

The spelling of 643299329 in words is "six hundred forty-three million, two hundred ninety-nine thousand, three hundred twenty-nine".