6644009 has 8 divisors (see below), whose sum is σ = 6840288. Its totient is φ = 6449440.

The previous prime is 6643999. The next prime is 6644023. The reversal of 6644009 is 9004466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6644009 - 2⁴ = 6643993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6644069) 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, 13994 + ... + 14460.

It is an arithmetic number, because the mean of its divisors is an integer number (855036).

Almost surely, 2^6644009 is an apocalyptic number.

It is an amenable number.

6644009 is a deficient number, since it is larger than the sum of its proper divisors (196279).

6644009 is a wasteful number, since it uses less digits than its factorization.

6644009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 6644009 is about 2577.5975248281. The cubic root of 6644009 is about 187.9937469627.

The spelling of 6644009 in words is "six million, six hundred forty-four thousand, nine".