6644223 has 6 divisors (see below), whose sum is σ = 9597224. Its totient is φ = 4429476.

The previous prime is 6644191. The next prime is 6644227. The reversal of 6644223 is 3224466.

It is not a de Polignac number, because 6644223 - 2⁵ = 6644191 is a prime.

It is a d-powerful number, because it can be written as 6 + 6⁷ + 4⁴ + 4¹⁰ + 2¹³ + 2¹⁹ + 3¹⁴ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 369115 + ... + 369132.

Almost surely, 2^6644223 is an apocalyptic number.

6644223 is a deficient number, since it is larger than the sum of its proper divisors (2953001).

6644223 is a wasteful number, since it uses less digits than its factorization.

6644223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738253 (or 738250 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 6644223 is about 2577.6390360173. The cubic root of 6644223 is about 187.9957653339.

Adding to 6644223 its reverse (3224466), we get a palindrome (9868689).

The spelling of 6644223 in words is "six million, six hundred forty-four thousand, two hundred twenty-three".