Answer :

iGreen
That is the millions place.

3,628,800
^Millions

3,628,800
   ^Hundred thousands

3,628,800
     ^Ten thousands

3,628,800
       ^Thousands

3,628,800
         ^Hundreds

3,628,800
           ^Tens
3,628,800
             ^Ones
the 3 in 3,628,800 is three millions because the last zero is ones,the other zero is tens,the eight is hundreds and so on...