Answer:
2147483648
Explanation:
The pattern being used is x4.
8 x 4 = 32
32 x 4 = 128
128 x 4 = 512
512 x 4 = 2048
2048 x 4 = 8192
8192 x 4 = 32768
32768 x 4 = 131072
131072 x 4 = 524288
524288 x 4 = 2097152
2097152 x 4 = 8388608
8388608 x 4 = 33554432
33554432 x 4 = 134217728
134217728 x 4 = 536870912
536870912 x 4 = 2147483648