Teaser 2911: Remembering PINs

From The Sunday Times, 8th July 2018 [link]

My 10-year-old grandson has several PINs of various lengths to remember. To help him in this, he has systematically replaced different digits by different letters to get corresponding words as THREE, FIVE, SIX, SEVEN, NINE, TEN and FIFTEEN. Being very clever, he has arranged it so that each PIN is divisible by the number specified by the corresponding word.

What is his PIN for FIFTEEN?