4558

Number
$4558$ (four thousand, five hundred and fifty-eight) is:
 * $2 \times 43 \times 53$


 * The $43$rd heptagonal number after $1$, $7$, $18$, $34$, $5$, $81$, $112$, $\ldots$, $3010$, $3186$, $3367$, $3744$, $3940$, $4141$, $4347$:
 * $4558 = \displaystyle \sum_{k \mathop = 1}^{43} \left({5 k - 4}\right) = \dfrac {43 \left({5 \times 43 - 3}\right)} 2$