This is easy. Just sort the digits in descending order. That works because the further left you go, the more significant the digit. So the largest number that can be made out of the digits 5, 3, 1, 4, and 7 is 75,431.
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75431
A number can be made into only one rectangle if it is a square number. A square number is a number that can be represented as the product of an integer with itself, such as 1, 4, 9, 16, and so on. These numbers have only one unique way of arranging their factors to form a rectangle, as the sides will be equal in length.
If the numbers are not repeated then the highest 5 digit even number to be made out of 0123456789 is : 98764.
It terminates. I believe that numbers that are non terminating are irrational. and numbers that can be made into a fraction, terminat, or repeat are rational.
The answer is 6.