7,777,777 = ((DCC))(DCCLXXVII)DCCLXXVII in Roman numerals
Numerals in double brackets indicate multiplication by ten thousand while numerals in single brackets indicate multiplication by a thousand.
Hence:
((DCC)) = 700*10,000 = 7,000,000
(DCCLXXVII) = 777*1,000 = 777,000
DCCLXXVII = 777
In reality such a large number would have probably been rounded off to the nearest million.
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Roman numerals were inspired by Etruscan numerals of which Roman numerals originated from.
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