665228 has 12 divisors (see below), whose sum is σ = 1225560. Its totient is φ = 315072.

The previous prime is 665221. The next prime is 665233. The reversal of 665228 is 822566.

It is a self number, because there is not a number n which added to its sum of digits gives 665228.

It is not an unprimeable number, because it can be changed into a prime (665221) by changing a digit.

665228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4301 + ... + 4452.

It is an arithmetic number, because the mean of its divisors is an integer number (102130).

2⁶⁶⁵²²⁸ is an apocalyptic number.

It is an amenable number.

665228 is a deficient number, since it is larger than the sum of its proper divisors (560332).

665228 is a wasteful number, since it uses less digits than its factorization.

665228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8776 (or 8774 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 665228 is about 815.6151053040. The cubic root of 665228 is about 87.2951616620.

The spelling of 665228 in words is "six hundred sixty-five thousand, two hundred twenty-eight".