12k gates will put you ~72,000 transistors for the gates but that is only the logic portion of it. The transistor count of a chip doesn't actually mean a damn thing though since most of that transistor count is accounted for through storage. Each bit of storage in a chip is 6 transistors so a 64k cache is 3.1M transistors, but those transistors tell you nothing about the actual capabilities of a chip.
Why do you need this info? You haven't answered it that, and without that context it stands at just a silly academic question with no merits.