666228 has 24 divisors (see below), whose sum is σ = 1582560. Its totient is φ = 218080.

The previous prime is 666203. The next prime is 666229. The reversal of 666228 is 822666.

It is a junction number, because it is equal to n+sod(n) for n = 666195 and 666204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666229) 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, 238 + ... + 1178.

It is an arithmetic number, because the mean of its divisors is an integer number (65940).

2⁶⁶⁶²²⁸ is an apocalyptic number.

It is an amenable number.

666228 is an abundant number, since it is smaller than the sum of its proper divisors (916332).

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

666228 is a wasteful number, since it uses less digits than its factorization.

666228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007 (or 1005 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 666228 is about 816.2279093489. The cubic root of 666228 is about 87.3388817380.

The spelling of 666228 in words is "six hundred sixty-six thousand, two hundred twenty-eight".