Time:

One of the most used Mesopotamian inventions is the concept of time, and the division of time units into 60 parts.

This led to the creation of minutes, hours, days, and the rest of our time system.

The Babylonians chose the number 60 likely due to their sexagesimal system of mathematics being based on their calculation of the 360 degrees around the sun. People of this time and age kept a 360 day year, rather then the 365 days we measure today. The number 60 also has a lot of divisors and is easy to work with.