LXXVIII; L = 50, X = 10, V = 5 and I = 1, but be careful... there are exceptions, too.
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78 in Roman numerals is LXXVIII.
1977 = MCMLXXVII 1978 = MCMLXXVIII
The equivalent of 78 as a Roman numeral is LXXVIII
In Roman numerals, it means N M C.
The Roman numeral "lxxviii" represents the number 78.