LXXXVI
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688.046
Converting between Arabic and Roman Numbers is done as : roman numeral number of 66 is : LXVI
86020 would be 86 Ms followed by XX. The accepted convention does not permit M to be repeated more 3 times in succession. MMMCMXCIX (3999) is therefore the largest valid Roman numeral.
VI
Roman numeral IX is 9, so six would be VI, IIIIX or IVX.