Who knows two hundred eighty-seven?
?שבעה ושמונים ומאתים - מי יודע
In the spirit of the song "Echad - mi yodeya", please post interesting and significant Jewish facts about the number 287.
There are probably references to lazy gematria for this one scattered all over the place.
Check out mi-yodeya-series for the previous two hundred eighty-six entries in this ongoing series.
Please include sources for your information wherever possible, as with all other answers on this site.