Three. On the grounds that the zero after the decimal point is an indicator of precision (rounding) rather than simply a [redundant] place holder.
there are 3 sig figs. 4, 0, and 5 are the sig figs
5 sig figs
There are four sig figs in 1.032
There are three sig figs in 4890.
There are four sig figs in 2.905.
There are 4 sig figs in 20.13
There are four sig figs in 60.55.
There are eight sig figs in 57.115102.
All five of them are sig figs
61 has 2 sig figs.
There are three sig figs in 1.05.
There are two sig figs in 290.