6644868 has 24 divisors (see below), whose sum is σ = 15607872. Its totient is φ = 2200224.

The previous prime is 6644863. The next prime is 6644873. The reversal of 6644868 is 8684466.

It is an interprime number because it is at equal distance from previous prime (6644863) and next prime (6644873).

It is not an unprimeable number, because it can be changed into a prime (6644863) 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, 121 + ... + 3647.

It is an arithmetic number, because the mean of its divisors is an integer number (650328).

Almost surely, 2^6644868 is an apocalyptic number.

It is an amenable number.

6644868 is an abundant number, since it is smaller than the sum of its proper divisors (8963004).

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

6644868 is a wasteful number, since it uses less digits than its factorization.

6644868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691 (or 3689 counting only the distinct ones).

The product of its digits is 221184, while the sum is 42.

The square root of 6644868 is about 2577.7641474735. The cubic root of 6644868 is about 188.0018484804.

The spelling of 6644868 in words is "six million, six hundred forty-four thousand, eight hundred sixty-eight".