6638944 has 24 divisors (see below), whose sum is σ = 14076720. Its totient is φ = 3063936.

The previous prime is 6638911. The next prime is 6638953. The reversal of 6638944 is 4498366.

It is a junction number, because it is equal to n+sod(n) for n = 6638897 and 6638906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7564 + ... + 8395.

It is an arithmetic number, because the mean of its divisors is an integer number (586530).

Almost surely, 2^6638944 is an apocalyptic number.

It is an amenable number.

6638944 is an abundant number, since it is smaller than the sum of its proper divisors (7437776).

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

6638944 is a wasteful number, since it uses less digits than its factorization.

6638944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15982 (or 15974 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 6638944 is about 2576.6148334588. The cubic root of 6638944 is about 187.9459630421.

The spelling of 6638944 in words is "six million, six hundred thirty-eight thousand, nine hundred forty-four".