Who knows eighty-seven?
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87 is the number of words in Baruch She'amar. It says that G-d is praised "in the mouth" -- בפה -- of his people. בפה has Gematria 87, for that reason. But some replace it with בפי, for grammatical correctness (even if it means losing the gematria).
Source: Rabbi Artscroll.
87 years passed from the establishment of the Jewish kingship (when Shaul was crowned, in the year 2882 since creation) until they came under the domination of a foreign king (Shishak the king of Egypt, who invaded and conquered parts of the Land of Israel in the fifth year of King Rechavam, 2969 since creation - I Kings 14:25ff and II Chron. 12:2ff).