MMMDVIII are the Roman numerals for 3528.
Improved Answer:
The above answer represents 3508 in Roman numerals whereas 3528 is actually MMMDXXVIII in Roman numerals.
XIII.
CDLXXVIII
LXXXI
XXI
MDCCCC.
47
70 = LXX
It is: 1066 = MLXVI
146
400 = CD
DCCCLXXXVIII
It is: 261 = CCLXI