|Divisors||1,2 5, 7, 10, 14, 35, 70|
Its factorization makes it a sphenic number. 70 is a Pell number and a generalized heptagonal number, one of only two numbers to be both. Also, it is the seventh pentagonal number and the fourth 13-gonal number, as well as the fifth pentatope number. It is the smallest weird number.
Since it is possible to find sequences of 70 consecutive integers such that each inner member member shares a factor with either the first or the last member, 70 is an Erdős–Woods number.
The prime factors of seventy are 2, 5, and 7. (2 * 5 * 7 = 70)