Earths diameter is 7,926 miles, which is the same as 41,849,280 feet.
If earth has 196,940,400 square miles of total surface area (land and water) as most of the websites indicate (some websites say 196,935,000 square miles). Multiply by 5,280 squared:...
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40 075 014 meters = 1.314797x10⁰⁸ feet
roughly 1,256,640,000 feet on the average