6439173868 has 12 divisors (see below), whose sum is σ = 11344183200. Its totient is φ = 3197978672.

The previous prime is 6439173857. The next prime is 6439173971. The reversal of 6439173868 is 8683719346.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5401396 + ... + 5402587.

It is an arithmetic number, because the mean of its divisors is an integer number (945348600).

Almost surely, 2^6439173868 is an apocalyptic number.

It is an amenable number.

6439173868 is a deficient number, since it is larger than the sum of its proper divisors (4905009332).

6439173868 is a wasteful number, since it uses less digits than its factorization.

6439173868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10804136 (or 10804134 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The square root of 6439173868 is about 80244.4631610182. The cubic root of 6439173868 is about 1860.4159346532.

The spelling of 6439173868 in words is "six billion, four hundred thirty-nine million, one hundred seventy-three thousand, eight hundred sixty-eight".