What is the sum of all the prime numbers less than 500 with only 3s and 4s as digits?

-What is the sum of all the prime numbers less than 500 with only 3s and 4s as digits?
-On Saturday, three different football games are televised at noon and four different games are televised at 8 p.m. On Sunday, five different games are televised at noon. If Amanda watches one Saturday game at noon and another at 8 p.m. and one game at noon on Sunday, how many different combinations of games can she watch?
-What is the sum of the positive integer factors of 2017?