78 vs large integer

78 and large integer both are nouns.

Word	Noun	Adjective	Verb	Adverb
78	Yes	Yes	No	No
large integer	Yes	No	No	No

As nouns, large integer is a hypernym of 78; that is, large integer is a word with a broader meaning than 78:

78 (noun)	large integer (noun)
a shellac based phonograph record that played at 78 revolutions per minute	an integer equal to or greater than ten
the cardinal number that is the sum of seventy and eight

78 (adjective)	large integer (adjective)
being eight more than seventy