6644144 has 40 divisors (see below), whose sum is σ = 14686560. Its totient is φ = 2884608.

The previous prime is 6644123. The next prime is 6644147. The reversal of 6644144 is 4414466.

It is not an unprimeable number, because it can be changed into a prime (6644147) 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, 2597 + ... + 4475.

It is an arithmetic number, because the mean of its divisors is an integer number (367164).

Almost surely, 2^6644144 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 6644144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7343280).

6644144 is an abundant number, since it is smaller than the sum of its proper divisors (8042416).

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

6644144 is a wasteful number, since it uses less digits than its factorization.

6644144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917 (or 1911 counting only the distinct ones).

The product of its digits is 9216, while the sum is 29.

The square root of 6644144 is about 2577.6237118711. The cubic root of 6644144 is about 187.9950202393.

The spelling of 6644144 in words is "six million, six hundred forty-four thousand, one hundred forty-four".