643214329 has 8 divisors (see below), whose sum is σ = 683008200. Its totient is φ = 603638016.

The previous prime is 643214321. The next prime is 643214333. The reversal of 643214329 is 923412346.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 139122025 + 504092304 = 11795^2 + 22452^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 643214329 - 2³ = 643214321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643214294 and 643214303.

It is not an unprimeable number, because it can be changed into a prime (643214321) 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, 48274 + ... + 60139.

It is an arithmetic number, because the mean of its divisors is an integer number (85376025).

Almost surely, 2^643214329 is an apocalyptic number.

It is an amenable number.

643214329 is a deficient number, since it is larger than the sum of its proper divisors (39793871).

643214329 is a wasteful number, since it uses less digits than its factorization.

643214329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108779.

The product of its digits is 31104, while the sum is 34.

The square root of 643214329 is about 25361.6704694308. The cubic root of 643214329 is about 863.2141886568.

The spelling of 643214329 in words is "six hundred forty-three million, two hundred fourteen thousand, three hundred twenty-nine".