The manual lists the microphone sample rate options as:
8180 Hz 10910 Hz 16360 Hz 32730 HzThe real values are
8182 Hz (32728/4) 10909 1/3 Hz (32728/3) 16364 Hz (32728/2) 32728 HzEven if 32730 was correct, 32730/2 is 16365, and 32730/4 is 8182.5, so it's clear that the values are all just rounded to the nearest 10 for some reason.