A digit.
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The numerals: V, L and D are only used once in a row The numerals: I, X, C and M are only used fourfold in a row
F is not used as a symbol in roman numeral system
64 in Roman numerals is LXIV
The Romans had no symbol for the currently used number zero. During the middle ages monks, who still wrote in Latin and still used Roman numerals, introduced the symbol 'N' (abbrieviated from the Latin word Nullae) to represent zero.
They contain a zero symbol whereas Roman numerals do not contain a zero symbol because it's not needed