From Wikipedia, the free encyclopedia.
One hundred seventy is the natural number following one hundred sixty-nine and
preceeding one hundred seventy-one. It's factorization is
making it a sphenic number. It is the smallest n for which φ(n) and σ(n) are
both square.
See also: one hundred sixty, one hundred eighty
One hundred seventy is also
- The designation of spur route of Interstate 70.
171 = 3^2 19, triangular number
172 = 2^2 43
173 = prime number, sum of three consecutive primes (53 + 59 + 61)
174 = 2 3 29, sphenic number
175 = 5^2 7
176 = 2^4 11, octagonal pentagonal number
177 = 3 59
178 = 2 89
179 = prime number
