Il numero romano MMMCMLXXVIII nel sistema decimale vale: 3978.
MMMCMLXXVIII in latino si scrive tria milia nongenti septuaginta octo,
mentre in italiano tremilanovecentosettantotto.
MMMCMLIX, MMMCMLX, MMMCMLXI, MMMCMLXII, MMMCMLXIII, MMMCMLXIV, MMMCMLXV, MMMCMLXVI, MMMCMLXVII, MMMCMLXVIII, MMMCMLXIX, MMMCMLXX, MMMCMLXXI, MMMCMLXXII, MMMCMLXXIII, MMMCMLXXIV, MMMCMLXXV, MMMCMLXXVI, MMMCMLXXVII, MMMCMLXXIX, MMMCMLXXX, MMMCMLXXXI, MMMCMLXXXII, MMMCMLXXXIII, MMMCMLXXXIV, MMMCMLXXXV, MMMCMLXXXVI, MMMCMLXXXVII, MMMCMLXXXVIII, MMMCMLXXXIX, MMMCMXC, MMMCMXCI, MMMCMXCII, MMMCMXCIII, MMMCMXCIV, MMMCMXCV, MMMCMXCVI, MMMCMXCVII