SB 10.90.41

tisraḥ koṭyaḥ sahasrāṇām
 aṣṭāśīti-śatāni ca
āsan yadu-kulācāryāḥ
 kumārāṇām iti śrutam
Synonyms: 
tisraḥ — three; koṭyaḥ — (times) ten million; sahasrāṇām — thousand; aṣṭā-aśīti — eighty-eight; śatāni — hundreds; ca — and; āsan — were; yadu-kula — of the Yadu family; ācāryāḥ — teachers; kumārāṇām — for the children; iti — thus; śrutam — has been heard.
Translation: 
I have heard from authoritative sources that the Yadu family employed 38,800,000 teachers just to educate their children.