987654
The greatest 4-digit number with no repeated digits is... 9876
98,764
987,654
987653
98,764
9876543.
98,764
98765
9876543
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'.
The largest number with no repeated digits is 9,876,543,210 although it is 10 digits long, the largest 3 digit number with no repeated digits is 987