No.
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infinity
The largest number you can write using Roman numerals without an overline at any symbol is 3999 (MMMCMXCIX), and the largest possible number is 3999999 (MMMCMXCIXCMXCIX, with an overline over the first nine letters.
874321 is the largest number made from all these digits.
86432
In the decimal system, the largest digit in any place is 9.