170 (number)

From Academic Kids

170 is the natural number following 169 and preceding 171.

Template:Numbers 100-200
OrdinalOne hundred [and]
seventy
Cardinal170th
Factorization<math> 2 \cdot 5 \cdot 17<math>
Roman numeralCLXX
Binary10101010
HexadecimalAA

One hundred seventy a sphenic number. It is the smallest n for which φ(n) and σ(n) are both square. 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.

One hundred seventy is also

Numbers in the 170s

171 = 3^2 19, triangular number, Harshad number


172 = 2^2 43, noncototient


173 = prime number, Sophie Germain prime, sum of three consecutive primes (53 + 59 + 61)


174 = 2 3 29, sphenic number, nontotient


175 = 5^2 7


176 = 2^4 11, pentagonal number, octagonal number, octagonal pentagonal number, self number


177 = 3 59


178 = 2 89


179 = prime number, Sophie Germain prime, safe prime, strictly non-palindromic number


ko:170
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