6389278864 has 40 divisors (see below), whose sum is σ = 12640719960. Its totient is φ = 3127799808.

The previous prime is 6389278837. The next prime is 6389278867. The reversal of 6389278864 is 4688729836.

It can be written as a sum of positive squares in 4 ways, for example, as 707134464 + 5682144400 = 26592^2 + 75380^2 .

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6389278867) 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, 140052 + ... + 179980.

It is an arithmetic number, because the mean of its divisors is an integer number (316017999).

Almost surely, 2^6389278864 is an apocalyptic number.

It is an amenable number.

6389278864 is a deficient number, since it is larger than the sum of its proper divisors (6251441096).

6389278864 is a wasteful number, since it uses less digits than its factorization.

6389278864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40147 (or 40141 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 61.

The square root of 6389278864 is about 79932.9648142742. The cubic root of 6389278864 is about 1855.5982226456.

The spelling of 6389278864 in words is "six billion, three hundred eighty-nine million, two hundred seventy-eight thousand, eight hundred sixty-four".