What numbers make a product of its digits are 6?

Answer 1

let this integer be (xy)

(xy) = 10x + y

10x+y = 2.x.y

10x + y - 2xy = 0

2x.(5-y) +y= 0

x= y / 2(y-5)

when the integer provides this condition, it is equal to twice the product of its digits.

And there is such only one integer.

36