6440788008 has 32 divisors (see below), whose sum is σ = 17891078400. Its totient is φ = 2146929264.

The previous prime is 6440788007. The next prime is 6440788009. The reversal of 6440788008 is 8008870446.

It is an interprime number because it is at equal distance from previous prime (6440788007) and next prime (6440788009).

It is not an unprimeable number, because it can be changed into a prime (6440788007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14909016 + ... + 14909447.

It is an arithmetic number, because the mean of its divisors is an integer number (559096200).

Almost surely, 2^6440788008 is an apocalyptic number.

It is an amenable number.

6440788008 is an abundant number, since it is smaller than the sum of its proper divisors (11450290392).

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

6440788008 is a wasteful number, since it uses less digits than its factorization.

6440788008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29818478 (or 29818468 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The square root of 6440788008 is about 80254.5201717635. The cubic root of 6440788008 is about 1860.5713749292.

The spelling of 6440788008 in words is "six billion, four hundred forty million, seven hundred eighty-eight thousand, eight".