6663228 has 72 divisors (see below), whose sum is σ = 18456144. Its totient is φ = 1858560.

The previous prime is 6663227. The next prime is 6663229. The reversal of 6663228 is 8223666.

6663228 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (6663227) and next prime (6663229).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18700 + ... + 19052.

Almost surely, 2^6663228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6663228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9228072).

6663228 is an abundant number, since it is smaller than the sum of its proper divisors (11792916).

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

6663228 is a wasteful number, since it uses less digits than its factorization.

6663228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 382 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 6663228 is about 2581.3229166456. The cubic root of 6663228 is about 188.1748411188.

The spelling of 6663228 in words is "six million, six hundred sixty-three thousand, two hundred twenty-eight".