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Rehoboam ... begat twenty and eight sons, and threescore daughters. 2 Chronicles 11:21
There are other men who might have had more children than Rehoboam. Gideon (Jg 8:30) and Ahab (10:1) each had 70 sons, and Abdon had 40 sons (Judges 12:13-14), but the Bible doesn't say how many daughters they had.