Il numero romano MMCDLXXX nel sistema decimale vale: 2480.
MMCDLXXX in latino si scrive duo milia quadringenti octoginta,
mentre in italiano duemilaquattrocentottanta.
MMCDLXI, MMCDLXII, MMCDLXIII, MMCDLXIV, MMCDLXV, MMCDLXVI, MMCDLXVII, MMCDLXVIII, MMCDLXIX, MMCDLXX, MMCDLXXI, MMCDLXXII, MMCDLXXIII, MMCDLXXIV, MMCDLXXV, MMCDLXXVI, MMCDLXXVII, MMCDLXXVIII, MMCDLXXIX, MMCDLXXXI, MMCDLXXXII, MMCDLXXXIII, MMCDLXXXIV, MMCDLXXXV, MMCDLXXXVI, MMCDLXXXVII, MMCDLXXXVIII, MMCDLXXXIX, MMCDXC, MMCDXCI, MMCDXCII, MMCDXCIII, MMCDXCIV, MMCDXCV, MMCDXCVI, MMCDXCVII, MMCDXCVIII, MMCDXCIX