How many significant figure in digit 8700?

Answer 1

0 (there are no numbers after the decimal point)

* * * * *

Wrong answer! But there is no simple correct answer.

Integers ending in 0 are ambiguous cases. It is not possible to say whether the number 8700 represent a value that has not been rounded (4 significant figures), rounded to the nearest ten (3 sig fig) or to the nearest hundreds (2 sig fig).