You have to specify the base. For example, in base-16, otherwise known as hexadecimal or hex, the greatest 5 digit number is FFFFF.
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99,990.
The number 9 is the greatest one-digit number.
fcfdfd
1
The greatest 3-digit number is 999. 9+9+9 = 27 The sum of the greatest 3-digit number is 27.