685228 has 12 divisors (see below), whose sum is σ = 1211112. Its totient is φ = 339200.

The previous prime is 685199. The next prime is 685231. The reversal of 685228 is 822586.

685228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 685228.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 373 + ... + 1228.

It is an arithmetic number, because the mean of its divisors is an integer number (100926).

2⁶⁸⁵²²⁸ is an apocalyptic number.

It is an amenable number.

685228 is a deficient number, since it is larger than the sum of its proper divisors (525884).

685228 is a wasteful number, since it uses less digits than its factorization.

With its successor (685229) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1710).

685228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712 (or 1710 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 685228 is about 827.7849962400. The cubic root of 685228 is about 88.1613774333.

The spelling of 685228 in words is "six hundred eighty-five thousand, two hundred twenty-eight".