23 × 57
1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 625, 1000, 1250, 2500, 3125, 5000, 6250, 12500, 15625, 25000, 31250, 62500, 78125, 125000, 156250, 312500 and 625000
No.
Its nearest Fibonacci number neighbors are 514229 and 832040.