Il numero romano MCMLXXVIII nel sistema decimale vale: 1978.
MCMLXXVIII in latino si scrive mille nongenti septuaginta octo,
mentre in italiano millenovecentosettantotto.
MCMLIX, MCMLX, MCMLXI, MCMLXII, MCMLXIII, MCMLXIV, MCMLXV, MCMLXVI, MCMLXVII, MCMLXVIII, MCMLXIX, MCMLXX, MCMLXXI, MCMLXXII, MCMLXXIII, MCMLXXIV, MCMLXXV, MCMLXXVI, MCMLXXVII, MCMLXXIX, MCMLXXX, MCMLXXXI, MCMLXXXII, MCMLXXXIII, MCMLXXXIV, MCMLXXXV, MCMLXXXVI, MCMLXXXVII, MCMLXXXVIII, MCMLXXXIX, MCMXC, MCMXCI, MCMXCII, MCMXCIII, MCMXCIV, MCMXCV, MCMXCVI, MCMXCVII