2628

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Number

$2628$ (two thousand, six hundred and twenty-eight) is:

$2^2 \times 3^2 \times 73$

The $72$nd triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $2211$, $2278$, $2346$, $2415$, $2485$, $2556$:

$2628 = \ds \sum_{k \mathop = 1}^{72} k = \dfrac {72 \times \paren {72 + 1} } 2$

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