Bluebulb Projects' The Measure of Things presents:
680 is about one-and-nine-tenths times the number of Sesame Seeds on a Big Mac bun.
In other words, the count of Sesame Seeds on a Big Mac bun is 0.530 times that amount.
(McDonald's sandwich; approximate figures)
Each McDonald's Big Mac crown bun contains about 350 sesame seeds. McDonald's serves about 1.57 million Big Macs to its customers each day.