686228 has 12 divisors (see below), whose sum is σ = 1253280. Its totient is φ = 328152.

The previous prime is 686209. The next prime is 686267. The reversal of 686228 is 822686.

It is a happy number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 686194 and 686203.

It is a congruent number.

It is an unprimeable number.

686228 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, 3638 + ... + 3821.

It is an arithmetic number, because the mean of its divisors is an integer number (104440).

2⁶⁸⁶²²⁸ is an apocalyptic number.

It is an amenable number.

686228 is a deficient number, since it is larger than the sum of its proper divisors (567052).

686228 is a wasteful number, since it uses less digits than its factorization.

686228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7486 (or 7484 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 686228 is about 828.3887976065. The cubic root of 686228 is about 88.2042432267.

The spelling of 686228 in words is "six hundred eighty-six thousand, two hundred twenty-eight".