300

Number
$300$ (three hundred) is:


 * $2^2 \times 3 \times 5^2$


 * The $24$th triangular number after $1, 3, 6, 10, 15, \ldots, 171, 190, 210, 231, 253, 276$:
 * $300 = \displaystyle \sum_{k \mathop = 1}^{24} k = \dfrac {24 \times \left({24 + 1}\right)} 2$


 * The $31$st highly abundant number after $1, 2, 3, 4, 6, 8, 10, \ldots, 120, 144, 168, 180, 210, 216, 240, 288$:
 * $\sigma \left({300}\right) = 868$