6668224 has 28 divisors (see below), whose sum is σ = 13663168. Its totient is φ = 3225600.

The previous prime is 6668213. The next prime is 6668237. The reversal of 6668224 is 4228666.

It is a super-2 number, since 2×6668224² = 88930422628352, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6668224.

It is a congruent number.

It is an unprimeable number.

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, 304 + ... + 3664.

Almost surely, 2^6668224 is an apocalyptic number.

6668224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6668224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6831584).

6668224 is an abundant number, since it is smaller than the sum of its proper divisors (6994944).

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

6668224 is a wasteful number, since it uses less digits than its factorization.

6668224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3404 (or 3394 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 6668224 is about 2582.2904561648. The cubic root of 6668224 is about 188.2218597030.

The spelling of 6668224 in words is "six million, six hundred sixty-eight thousand, two hundred twenty-four".