100,000,000
It is: 1.0*108
Oh, dude, you're really making me do math right now? Fine, fine. 10 to the power of 8 equals 100,000,000. There you go, hope that satisfies your need for big numbers.
3.072E8 would be more commonly written as 3.072x108. 10 to the power 8 is 8 lots of 10 all multiplied together. This is 10x10x10x10x10x10x10x10, or 100,000,000. Multiply this by 3.072 and you get 307,200,000. Thus 3.072E8 in standard form is 307,200,000.