Multiple inputs of two-variable functions

I want to define a function as f=(y+x), where x and y are the divisors of 3600. For example, a =3600,1800... and b=1,2.... I can get the function to work for a single value of a and b, but not for multiple inputs. What command am I missing out?

[Steven Lord]

Show the exact code you've written for your function and describe what happens when you pass in non-scalar inputs. [Does it give you a different answer than you expect? Does it throw an error? If so what is the full text of that error message?]