82

Number
$82$ (eighty-two) is:


 * $2 \times 41$


 * The $26$th semiprime:
 * $82 = 2 \times 41$


 * The $15$th happy number after $1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79$:
 * $82 \to 8^2 + 2^2 = 64 + 4 = 68 \to 6^2 + 8^2 = 36 + 64 = 100 \to 1^2 + 0^2 + 0^2 = 1$