 170 (number)

170 (one hundred [and] seventy) is the natural number following 169 and preceding 171.
List of numbers — Integers Cardinal One hundred [and]
seventyOrdinal 170th Factorization Divisors 1, 2, 5, 10, 17, 34, 85, 170 Roman numeral CLXX Binary 10101010 Hexadecimal AA Contents
In mathematics
170 is the smallest n for which φ(n) and σ(n) are both square(64 and 324 respectively). But 170 is never a solution for φ(x), making it a nontotient. Nor is it ever a solution to x  φ(x), making it a noncototient.
The proper divisors of 170 are 1, 2, 5, 10, 17, 34, and 85. These add up to 154, which is less than 170, and thus 170 is a deficient number.
Written as 2222 in base 4, 170 is a repdigit.
170 is the largest integer for which Google's builtin calculator function can compute the factorial, returning the answer as 170! = 7.25741562 × 10^{306}.
In sports
 170 is the maximum checkout possible in a standard game of darts (where the final score must be a double).^{[citation needed]} It consists of two trebletwenties and a doublebullseye.
See also
 170s
 E170 (disambiguation)
 F170 (disambiguation)
 List of highways numbered 170
 United States Supreme Court cases, Volume 170
 United Nations Security Council Resolution 170
 Pennsylvania House of Representatives, District 170
 170th meridian west and 170th meridian east
External links
Categories: Integers
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