2 x 420
3 x 280
4 x 210
5 x 168
6 x 140
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Stings with four factor that make 840
840=2*2*2*3*5*7
At least thirty-six of them.
There are a lot like 3x56x5 and there are a thousand more but i just don't want to write them all :)
3 x 5 x 7 x 8 2 x 6 x 7 x 10