136

Number
$136$ (one hundred and thirty-six) is:
 * $2^3 \times 17$


 * The $16$th triangular number after $1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120$:
 * $136 = \displaystyle \sum_{k \mathop = 1}^{16} k = \dfrac {16 \times \left({17 + 1}\right)} 2$


 * The $2$nd of the $4$ cubic recurring digital invariants after $55$:
 * $136 \to 244 \to 136$