וַתְּהִי֙ הַֽמֶּחֱצָ֔ה חֵ֕לֶק הַיֹּצְאִ֖ים בַּצָּבָ֑א מִסְפַּ֣ר הַצֹּ֗אן שְׁלֹשׁ־מֵא֥וֹת אֶ֙לֶף֙ וּשְׁלֹשִׁ֣ים אֶ֔לֶף וְשִׁבְעַ֥ת אֲלָפִ֖ים וַחֲמֵ֥שׁ מֵאֽוֹת׃
And the half, which was the portion of them that went out to war, was in number three hundred thousand and thirty thousand and seven thousand and five hundred sheep.
Read midrashic interpretation of Numbers 31:36: and classical rabbinic exegesis.