The number 70 (seventy) is the natural number between 69 and 71. In mathematics, it is notably defined as the smallest weird number—a number that is abundant (the sum of its proper divisors is greater than itself) but not semi-perfect (no subset of those divisors adds up to the number).
Explore the mathematical properties and educational concepts of the number seventy through these videos:
Learn Numbers 1 to 70 | Learn Counting Numbers | ESL for Kids 509K views · 3 years ago YouTube · Fun Kids English