When to use 'divisible' vs 'dividable'

I realised today that I use the terms divisible and dividable interchangeably, even though there may be a difference between them.

If they are in fact different, I'm interested in any general rule that might apply to a large case of similarly related terms as well.

Solution 1:

In common usage there may be little or no difference in meaning; but in mathematical writing, divisible has an accepted usage not held by dividable. Oxford Dictionary gives “Mathematics (of a number) containing another number a number of times without a remainder: 24 is divisible by 4” as sense 2 of divisible. Sometimes redundant wording like evenly divisible is used, and I suppose evenly dividable could be used, but it isn't.

I don't know of a general rule. Incidentally, as seen via links in google books, dividable is a word respectable enough to use, in spite of suffering some disrespect, as in following:

Solution 2:

Use dividable only if you want to appear strange... GoogleFight: