What is 5 to the power of 8 ?What is 5 to the power of 8 ?Solution: 58 = 390,625simplify this: All that is needed is to multiply it out:5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 = 390,625 So, 5 to the power of 8 is 390,625.