6644389488 has 40 divisors (see below), whose sum is σ = 18725099136. Its totient is φ = 2013451200.

The previous prime is 6644389487. The next prime is 6644389511. The reversal of 6644389488 is 8849834466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644389481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6291508 + ... + 6292563.

Almost surely, 2^6644389488 is an apocalyptic number.

It is an amenable number.

6644389488 is an abundant number, since it is smaller than the sum of its proper divisors (12080709648).

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

6644389488 is a wasteful number, since it uses less digits than its factorization.

6644389488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12584093 (or 12584087 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 60.

The square root of 6644389488 is about 81513.1246364658. The cubic root of 6644389488 is about 1879.9733555904.

The spelling of 6644389488 in words is "six billion, six hundred forty-four million, three hundred eighty-nine thousand, four hundred eighty-eight".