1.0E7 equals 10,000,000. If you want to be fancy, it's basically a form of scientific notation.
1.0E7 = 1 * 10^7 = 10,000,000. An easier way to think is to get the number after E and place that much number of zeros after 1. So if I said 1.0E5, there are 5 zeros after the number 1 equalling to...