667228 has 6 divisors (see below), whose sum is σ = 1167656. Its totient is φ = 333612.

The previous prime is 667211. The next prime is 667229. The reversal of 667228 is 822766.

It is a happy number.

667228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 667228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667229) by changing a digit.

667228 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 as a sum of consecutive naturals, namely, 83400 + ... + 83407.

2⁶⁶⁷²²⁸ is an apocalyptic number.

It is an amenable number.

667228 is a deficient number, since it is larger than the sum of its proper divisors (500428).

667228 is a wasteful number, since it uses less digits than its factorization.

667228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166811 (or 166809 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 667228 is about 816.8402536604. The cubic root of 667228 is about 87.3825580870.

It can be divided in two parts, 667 and 228, that multiplied together give a triangular number (152076 = T₅₅₁).

The spelling of 667228 in words is "six hundred sixty-seven thousand, two hundred twenty-eight".