The number 70 is a natural integer following 69 and preceding 71. It is best known in mathematics as the smallest weird number. Mathematical Properties
Weird Number: It is abundant (the sum of its proper divisors, 1+2+5+7+10+14+35=74, is greater than 70), but it is not semi-perfect because no subset of those divisors adds up to exactly 70.
Sphenic Number: It is the product of exactly three distinct prime numbers (2 × 5 × 7).
Harshad Number: It is evenly divisible by the sum of its digits (7 + 0 = 7).
Goldbach Property: It is the smallest number that can be written as the sum of two primes in six different ways (3+67, 11+59, 17+53, 23+47, 29+41, and 31+39 is invalid as 39 is composite, but 17+53, 11+59, etc. work out to 6 distinct valid prime pairs). Other Meanings
Historical/Religious: In Jewish tradition, the Septuagint (the Greek translation of the Hebrew Bible) is named after the 70 (or 72) scholars who translated it. The Roman numeral for 70, LXX, serves as its universal abbreviation.
Science: 70 Panopaea is a large, dark main-belt asteroid discovered in 1861. What context