685028 has 12 divisors (see below), whose sum is σ = 1228332. Its totient is φ = 334080.

The previous prime is 685019. The next prime is 685031. The reversal of 685028 is 820586.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 322624 + 362404 = 568^2 + 602^2 .

It is an Ulam number.

It is a nialpdrome in base 7.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1925 + ... + 2252.

It is an arithmetic number, because the mean of its divisors is an integer number (102361).

2⁶⁸⁵⁰²⁸ is an apocalyptic number.

It is an amenable number.

685028 is a deficient number, since it is larger than the sum of its proper divisors (543304).

685028 is a wasteful number, since it uses less digits than its factorization.

685028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222 (or 4220 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 685028 is about 827.6641831081. The cubic root of 685028 is about 88.1527992709.

The spelling of 685028 in words is "six hundred eighty-five thousand, twenty-eight".