Hecho matemático: 7734 is the sum of its proper divisors that contain the digit 8.
Trivia: 7734 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: March 4th is the day in 1985 that the Food and Drug Administration approves a blood test for AIDS, used since then for screening all blood donations in the United States.