6644844008 has 128 divisors (see below), whose sum is σ = 15149376000. Its totient is φ = 2697649920.

The previous prime is 6644843999. The next prime is 6644844029. The reversal of 6644844008 is 8004484466.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a self number, because there is not a number n which added to its sum of digits gives 6644844008.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2083391 + ... + 2086577.

It is an arithmetic number, because the mean of its divisors is an integer number (118354500).

Almost surely, 2^6644844008 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 6644844008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7574688000).

6644844008 is an abundant number, since it is smaller than the sum of its proper divisors (8504531992).

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

6644844008 is a wasteful number, since it uses less digits than its factorization.

6644844008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3295 (or 3291 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 44.

The square root of 6644844008 is about 81515.9126060673. The cubic root of 6644844008 is about 1880.0162221325.

The spelling of 6644844008 in words is "six billion, six hundred forty-four million, eight hundred forty-four thousand, eight".