6439999346 has 16 divisors (see below), whose sum is σ = 11092822560. Its totient is φ = 2773205280.

The previous prime is 6439999301. The next prime is 6439999351.

It is a happy number.

6439999346 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7702931 + ... + 7703766.

It is an arithmetic number, because the mean of its divisors is an integer number (693301410).

Almost surely, 2^6439999346 is an apocalyptic number.

6439999346 is a deficient number, since it is larger than the sum of its proper divisors (4652823214).

6439999346 is a wasteful number, since it uses less digits than its factorization.

6439999346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15406729.

The product of its digits is 34012224, while the sum is 62.

The square root of 6439999346 is about 80249.6065161693. The cubic root of 6439999346 is about 1860.4954307105.

The spelling of 6439999346 in words is "six billion, four hundred thirty-nine million, nine hundred ninety-nine thousand, three hundred forty-six".