Product = Sum? You Must be Kidding!

Math Puzzle - Sum Equals Product

What is the only 2-digit number where the product of its digits equals the sum of its digits?

E.g. could it be 37?  3×7=21.  3+7=10.  These don’t match, so it’s not 37.  What is it then?  Answer:  22.  2×2 = 2+2 = 4

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