684228 has 24 divisors (see below), whose sum is σ = 1681120. Its totient is φ = 216000.

The previous prime is 684221. The next prime is 684239. The reversal of 684228 is 822486.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 684195 and 684204.

It is not an unprimeable number, because it can be changed into a prime (684221) by changing a digit.

684228 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 7 ways as a sum of consecutive naturals, for example, 1273 + ... + 1728.

2⁶⁸⁴²²⁸ is an apocalyptic number.

It is an amenable number.

684228 is an abundant number, since it is smaller than the sum of its proper divisors (996892).

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

684228 is a wasteful number, since it uses less digits than its factorization.

684228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027 (or 3025 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 684228 is about 827.1807541281. The cubic root of 684228 is about 88.1184699150.

The spelling of 684228 in words is "six hundred eighty-four thousand, two hundred twenty-eight".