531
8643
9531
Assuming each digit only once: 65432 (and no further mathematical operations).
The highest number you can make out of the digits 2 4 0 and 1 is 4210.
974
get the numbers and order them from biggest to smallest.
The biggest number that can be made by arranging the digits is 951. However, 9^51 is a little under 5 trillion trillion trillion trillion, much larger than 951.
9,531 How about (5)931 ?
87531
It is 4579.
98765.
Using only the digits and the basic operators of arithmetic, 71. If other operators are allowed then 71! = 8.5*10101 approx, or 85 googol is one possible answer.