Il numero romano MMMDLXXX nel sistema decimale vale: 3580.
MMMDLXXX in latino si scrive tria milia quingenti octoginta,
mentre in italiano tremilacinquecentottanta.
MMMDLXI, MMMDLXII, MMMDLXIII, MMMDLXIV, MMMDLXV, MMMDLXVI, MMMDLXVII, MMMDLXVIII, MMMDLXIX, MMMDLXX, MMMDLXXI, MMMDLXXII, MMMDLXXIII, MMMDLXXIV, MMMDLXXV, MMMDLXXVI, MMMDLXXVII, MMMDLXXVIII, MMMDLXXIX, MMMDLXXXI, MMMDLXXXII, MMMDLXXXIII, MMMDLXXXIV, MMMDLXXXV, MMMDLXXXVI, MMMDLXXXVII, MMMDLXXXVIII, MMMDLXXXIX, MMMDXC, MMMDXCI, MMMDXCII, MMMDXCIII, MMMDXCIV, MMMDXCV, MMMDXCVI, MMMDXCVII, MMMDXCVIII, MMMDXCIX