I don't think so its possible in Anaplan. If this would have been a case then it would be very difficult for the End user to actually differentiate between 50 and 50 Million. We would lose the credibility of the data in all the other dashboards.
What you can do is make the user to input 50 and edit the format of the data (refer below snip)
And whenever you are using this data, just multiply by 1000000 in your calculations.