6644213 has 4 divisors (see below), whose sum is σ = 6656460. Its totient is φ = 6631968.

The previous prime is 6644191. The next prime is 6644227. The reversal of 6644213 is 3124466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3411409 + 3232804 = 1847^2 + 1798^2 .

It is a cyclic number.

It is not a de Polignac number, because 6644213 - 2⁶ = 6644149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5270 + ... + 6407.

It is an arithmetic number, because the mean of its divisors is an integer number (1664115).

Almost surely, 2^6644213 is an apocalyptic number.

It is an amenable number.

6644213 is a deficient number, since it is larger than the sum of its proper divisors (12247).

6644213 is a wasteful number, since it uses less digits than its factorization.

6644213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12246.

The product of its digits is 3456, while the sum is 26.

The square root of 6644213 is about 2577.6370962570. The cubic root of 6644213 is about 187.9956710185.

Adding to 6644213 its reverse (3124466), we get a palindrome (9768679).

The spelling of 6644213 in words is "six million, six hundred forty-four thousand, two hundred thirteen".