וַֽיְחִ֣י מְתוּשֶׁ֗לַח אַֽחֲרֵי֙ הוֹלִיד֣וֹ אֶת־לֶ֔מֶךְ שְׁתַּ֤יִם וּשְׁמוֹנִים֙ שָׁנָ֔ה וּשְׁבַ֥ע מֵא֖וֹת שָׁנָ֑ה וַיּ֥וֹלֶד בָּנִ֖ים וּבָנֽוֹת׃
And Methuselah lived after he begot Lamech seven hundred eighty and two years, and begot sons and daughters.
Read kabbalistic (mystical) interpretation of Genesis 5:26: and classical mystical sources.