What is Earth's spatial surface?
Total surface area of earth: 510,072,000 sq km
Total water surface area: 70.8% (361,132,000 sq km) Total land surface area: 29.2% (148,940,000 sq km)
According to modern estimates, the surface area of the Earth is approximately 510 million square km
A nice detailed discussion of the non-spherical model calculations (with graphics) is here: