MMMCDLXXX is a Roman numeral representation of the number 3480. In Roman numerals:

M represents 1000 M represents 1000 M represents 1000 CD represents 400 L represents 50 X represents 10 X represents 10 X represents 10

When you add these values together, you get:

1000 + 1000 + 1000 + 400 + 50 + 10 + 10 + 10 = 3480

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