וַיִּהְי֥וּ פְקֻדֵיהֶ֖ם לְמִשְׁפְּחֹתָ֑ם אַלְפַּ֕יִם שְׁבַ֥ע מֵא֖וֹת וַחֲמִשִּֽׁים׃
And those that were numbered of them by their families were two thousand seven hundred and fifty.
Read midrashic interpretation of Numbers 4:36: and classical rabbinic exegesis.