304
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Number
$304$ (three hundred and four) is:
- $2^4 \times 19$
- The $6$th primitive abundant number after $20$, $70$, $88$, $104$, $272$:
- $1 + 2 + 4 + 8 + 16 + 19 + 38 + 76 + 152 = 316 > 304$
- The $7$th primitive semiperfect number after $6$, $20$, $28$, $88$, $104$, $272$:
- $304 = 1 + 2 + 16 + 19 + 38 + 76 + 152$
- The smallest positive integer which can be expressed as the sum of $2$ distinct lucky numbers in $18$ different ways
- The $23$rd untouchable number after $2$, $5$, $52$, $88$, $96$, $120$, $124$, $\ldots$, $262$, $268$, $276$, $290$, $292$
- The $50$th nontotient:
- $\nexists m \in \Z_{>0}: \map \phi m = 304$
- where $\map \phi m$ denotes the Euler $\phi$ function