The prime factorization is the longest factor sting.
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The longest factor string you can make for 231 is 3x7x11.
2x2x2x3
the longest factor string for 840 is: 2x2x2x3x5x7. I hoped that helped m! Have a good rest of your day!
2x2x5x5
2*2*2*2*3*3*5=720