999,999,999,999
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Simply rearranging the digits, the largest number is 5432. Much larger numbers are possible if other operations are allowed.
There are 4 possible numbers if the digits are not repeated; 18 if they are. Those are 3-digit numbers, assuming that zero would not be a leading digit. If zero is allowed for a leading digit, then you can have 6 for the non repeated, and 27 if repetition.
This permutation problem depends on whether the numbers are allowed to be repeated. If they are, there are a possible 9999 numbers, starting with 0001 and running sequentially to 9999. If they are not allowed to be repeated, there are a possible 5040 combinations.
Assuming no repeated digits, lowest first, 20; in any order 120; Allowing repeated digits: 216
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