It is: 205 = CCV in Roman numerals
We do use Roman numerals today. For example, Roman numerals are often found in making outlines; to label book chapters; to label the frontmatter (pages) in books.
The Roman numerals for 64 are ILXV (65-1) or LXIIII (64) and they are not LXIV. So your question is: What is the cube root of LXIIII in Arabic numerals? The answer is 4 which is IIII or IV in Roman numerals.
As written 'mcmlxxx' it is meaningless. Roman Numerals are ALWAYS CAPITAL letters ; MCMLXXX MCMLXXX = 1980.
They are: CCCLXXI = 371
II.XIV.MMXI
February 14 2001
II-XIV-MCMXCIII
In todays modern notation of Roman numerals: II-XIV-MMXIII Note that the ancient Romans would have wrote out the equivalent of 14 as XIIII
14=xiv February=FEB. 2010=MMX Therefore; 14 February 2010 = xiv FEB. MMX
February is the second month and would be II. The 14th is represented by XIV. And the year would be MCMXC. So it would normally be shown as II-XIV-MCMXC.Additional Information:-In today's notation of Roman numerals 1959 is MCMLIX and not MCMXC which represents 1990
20th February 2010 in Roman numerals is: XX February MMX
In Roman numerals, the 27th February 2011 is XXVIIth February MMXI
February is the second month, so you would write it as IIin Roman numerals.
February II MMVIIII or II-II-IMMX. Note that 2009 in Roman numerals is not MMIX.
In today's terms February-21-1992 expressed in Roman numerals is February-XXI-MCMXCII.
25th February 2004 in Roman numerals is XXV.II.MMIV.