987654
The greatest 4-digit number with no repeated digits is... 9876
98,764
9876543.
98,764
987,654
987653
98765
9876543
98,764
94205 if digits are not to be repeated and 99999 if digits can be repeated
The largest ten digit number with no repeated digits is '9876543210'.
It is 9998, or if the digits can't be repeated, it is 9876.