The sun is estimated at 1.409 x 10 to the eighteenth power cu km.
The earth is estimated at 1.08321 x 10 to the twelfth power cu km.
The ratio of the two volumes comes out to about 1,280,909 cu km. I call that 1,300,000 times a big.
Right you are.
My 5.3 million figure is only off by a factor (4/3)*Pi
Remind me to mind my “Pints and Quarts” in the future.