yes, you basically ran into a limitation here. Formulas do not support any separators at this time, so you would have to write the number as
The formulas will then work, but I acknowledge that this doesn't look very nice, without formatting.
Now, I could imagine that it's possible to format the numbers before they are printed to the page, i.e. that in the backend and in the formulas, the numbers are written as 83649, but when printed to the page, they appear as 83,649. Unfortunately, I don't have the code for this readily available at the moment, as my time is limited.