477

Number
$477$ (four hundred and seventy-seven) is:


 * $3^2 \times 53$


 * The $18$th pentagonal number after $1$, $5$, $12$, $22$, $35$, $51$, $70$, $92$, $117$, $145$, $176$, $210$, $247$, $287$, $330$, $330$, $376$, $425$:
 * $477 = \displaystyle \sum_{k \mathop = 1}^{18} \left({3 k - 2}\right) = \dfrac {18 \left({3 \times 18 - 1}\right)} 2$