How many electors in the electorial college ?

Answer 1

There are about 538 electors which is based on the representation in both houses in congress (435 representatives, 100 senators from the fifty states and three electors from Washington, D.C.).

Answer 2

There are 538 electors in the electoral college, each one casts a single vote but a single state may send a number of electors (proportionate to their allotted electoral votes) to the electoral college.