1500 Models 35s were produced in 1947-1948. 13 of those airframes were rebuilt into 35R configuration at the Beech factory in 1951.
There are currently 267 Model 35s and 7 35Rs on the FAA registry. There may be a few registered in other countries--it's difficult to access registrations abroad. Since the U.S. does not require reporting of annual flight hours for each aircraft, there is no definitive way to determine how many of the airplanes registered are still actively flying.