The 7 is in a place that is 100 times greater than the place of the 5. The 1 is in a place that is 10 times less than the place of the 7. The 8 is in a place that is 10 times less than the place of the 5. The 4 is in a place that is 100 times greater than the 1. What is the 5-digit mystery number?