וַיִּֽהְיוּ֙ פְּקֻ֣דֵיהֶ֔ם לְמִשְׁפְּחֹתָ֖ם לְבֵ֣ית אֲבֹתָ֑ם אַלְפַּ֕יִם וְשֵׁ֥שׁ מֵא֖וֹת וּשְׁלֹשִֽׁים׃
even those that were numbered of them, by their families, by their fathers’houses, were two thousand and six hundred and thirty.
Read midrashic interpretation of Numbers 4:40: and classical rabbinic exegesis.