What number is greater 3.5E8 or 1.5E7?

To compare the two numbers, we can convert them into standard numerical form. (3.5E8) is equal to (3.5 \times 10^8), which is (350,000,000), while (1.5E7) is equal to (1.5 \times 10^7), which is (15,000,000). Therefore, (3.5E8) (350 million) is greater than (1.5E7) (15 million).