Hecho general: 8564 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 8564 is an uninteresting number.
Trivia: 8564 is a boring number.
Fecha histórica: June 12th is the day in 1967 that the United States Supreme Court in Loving v. Virginia declares all U.S. state laws which prohibit interracial marriage to be unconstitutional.