What is the highest point on earth, highest meaning the farthest away from the earth's center?

The answer is the peak of Mt. Chimborazo in Ecuador. See, the earth isn't a perfect sphere. It bulges out several miles at the equator. Mountains on or near the equator have a height advantage.

Mt. Everest is about 29,500 feet above sea level, making it the world's tallest mountain above sea level. However, that's different from being the point farthest away from the earth's center. Mt. Chimborazo is only 19,700 feet above sea level. Because it's elevated by the bulging equator, the peak of Mt. Chimborazo is actually about a mile farther away from the earth's center than Mt. Everest.