643929346 has 8 divisors (see below), whose sum is σ = 969902604. Its totient is φ = 320628480.

The previous prime is 643929337. The next prime is 643929353.

643929346 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 643383225 + 546121 = 25365^2 + 739^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 643929296 and 643929305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 667495 + ... + 668458.

Almost surely, 2^643929346 is an apocalyptic number.

643929346 is a deficient number, since it is larger than the sum of its proper divisors (325973258).

643929346 is a wasteful number, since it uses less digits than its factorization.

643929346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336196.

The product of its digits is 839808, while the sum is 46.

The square root of 643929346 is about 25375.7629638992. The cubic root of 643929346 is about 863.5339287644.

The spelling of 643929346 in words is "six hundred forty-three million, nine hundred twenty-nine thousand, three hundred forty-six".