וַיִּהְי֖וּ פְּקֻדֵיהֶ֑ם שְׁמֹנַ֣ת אֲלָפִ֔ים וַחֲמֵ֥שׁ מֵא֖וֹת וּשְׁמֹנִֽים׃
even those that were numbered of them, were eight thousand and five hundred and fourscore.
Read kabbalistic (mystical) interpretation of Numbers 4:48: and classical mystical sources.