For a math and computer science double major there is no overlap; there are 10 math courses required and 8 computer science courses required. I wouldn’t recommend doing a double major with computer science as both departments have extremely difficult courses and I think it might be overload. Double majoring in math and economics is pretty common as well and I think it’s more manageable. A joint major with journalism is possible as well.
Here is the link to the requirements for Math/Comp Science and Math/ Econ majors: