To find the greatest number that can be formed using the digits 5, 3, 1, 4, and 7, we need to arrange these digits in descending order. This means we start with the highest digit and work our way down to the lowest.
The digits in descending order are: 7, 5, 4, 3, and 1.
When we put them together, the greatest number we can make is 75431. This number uses each digit exactly once and is the largest combination possible with those specific digits.