Il numero romano MMDCCCLXXX nel sistema decimale vale: 2880.
MMDCCCLXXX in latino si scrive duo milia octingenti octoginta,
mentre in italiano duemilaottocentottanta.
MMDCCCLXI, MMDCCCLXII, MMDCCCLXIII, MMDCCCLXIV, MMDCCCLXV, MMDCCCLXVI, MMDCCCLXVII, MMDCCCLXVIII, MMDCCCLXIX, MMDCCCLXX, MMDCCCLXXI, MMDCCCLXXII, MMDCCCLXXIII, MMDCCCLXXIV, MMDCCCLXXV, MMDCCCLXXVI, MMDCCCLXXVII, MMDCCCLXXVIII, MMDCCCLXXIX, MMDCCCLXXXI, MMDCCCLXXXII, MMDCCCLXXXIII, MMDCCCLXXXIV, MMDCCCLXXXV, MMDCCCLXXXVI, MMDCCCLXXXVII, MMDCCCLXXXVIII, MMDCCCLXXXIX, MMDCCCXC, MMDCCCXCI, MMDCCCXCII, MMDCCCXCIII, MMDCCCXCIV, MMDCCCXCV, MMDCCCXCVI, MMDCCCXCVII, MMDCCCXCVIII, MMDCCCXCIX