Fatto generale: 2784 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2784 is a boring number.
Trivia: 2784 is an unremarkable number.
Data storica: August 15th is the day in 1974 that Yuk Young-soo, First Lady of South Korea, is killed during an apparent assassination attempt upon President of South Korea, Park Chung-hee.