Hi Nick,
3,670,016 / 16,384 = 224 262,144 / 16,384 = 16 262,144 / 16,384 = 16 262,144 / 16,384 = 16 28,311,552 / 16,384 = 1,728 786,432 / 16,384 = 48
So you would put in the number 224 in the flash_erase line at the end..
flash_erase /dev/mtd0 0 224
I'd say yes, based on https://github.com/vamanea/mtd-utils/blob/master/flash_erase.c#L60
Others that have actually used flash_erase may want to chip in.