How many of the twelve disciples did Jesus select to be an apostle?

The disciples were the apostles. It's an almost interchangeable term. Jesus had numerous disciples. At one point he sent at least 72 disciples, or followers, out to spread his teaching. The apostles were the "big 12," plus Paul, who were the closest to Jesus. They also stayed with him through thick and thin, as shown in John 6:60-69; see the Related Links section for a link to the passage online.