228

Number
$228$ (two hundred and twenty-eight) is:
 * $2^2 \times 3 \times 19$


 * The $2$nd integer after $3$ whose square is the sum of $2$ coprime cubes:
 * $228^2 = 37^3 + 11^3$


 * The $3$rd element of the $2$nd set of $4$ positive integers which form an arithmetic sequence which all have the same Euler $\phi$ value:
 * $\map \phi {216} = \map \phi {222} = \map \phi {228} = \map \phi {234} = 72$


 * The $14$th of the $17$ positive integers for which the value of the Euler $\phi$ function is $72$:
 * $73$, $91$, $95$, $111$, $117$, $135$, $146$, $148$, $152$, $182$, $190$, $216$, $222$, $228$, $234$, $252$, $270$