6439494768 has 320 divisors, whose sum is σ = 20252037120. Its totient is φ = 1725235200.

The previous prime is 6439494751. The next prime is 6439494779. The reversal of 6439494768 is 8674949346.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66386496 + ... + 66386592.

It is an arithmetic number, because the mean of its divisors is an integer number (63287616).

Almost surely, 2^6439494768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6439494768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10126018560).

6439494768 is an abundant number, since it is smaller than the sum of its proper divisors (13812542352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6439494768 is a wasteful number, since it uses less digits than its factorization.

6439494768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 290 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 60.

The square root of 6439494768 is about 80246.4626510104. The cubic root of 6439494768 is about 1860.4468391123.

The spelling of 6439494768 in words is "six billion, four hundred thirty-nine million, four hundred ninety-four thousand, seven hundred sixty-eight".