6644889 has 16 divisors (see below), whose sum is σ = 10363200. Its totient is φ = 4196448.

The previous prime is 6644887. The next prime is 6644903. The reversal of 6644889 is 9884466.

It is a happy number.

It is not a de Polignac number, because 6644889 - 2¹ = 6644887 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6644887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5964 + ... + 6989.

It is an arithmetic number, because the mean of its divisors is an integer number (647700).

Almost surely, 2^6644889 is an apocalyptic number.

It is an amenable number.

6644889 is a deficient number, since it is larger than the sum of its proper divisors (3718311).

6644889 is a wasteful number, since it uses less digits than its factorization.

6644889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12981 (or 12975 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 6644889 is about 2577.7682207677. The cubic root of 6644889 is about 188.0020465297.

The spelling of 6644889 in words is "six million, six hundred forty-four thousand, eight hundred eighty-nine".