What least number should be subtracted from 13605 such that the remainder…

What least number should be subtracted from 13605 such that the remainder is divisible by 87 ?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #27742