144

Number
$144$ (one hundred and forty-four) is:


 * $2^4 \times 3^2$


 * The $12$th square number after $1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121$:
 * $144 = 12^2 = \left({2^2 \times 3}\right)^2$


 * Hence in duodecimal notation:
 * $100$


 * The $12$th Fibonacci number, after $1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89$:
 * $144 = 55 + 89$


 * The only Square Fibonacci Number apart from $1$, coincidentally equalling the square of its index.
 * $F_{12} = 144 = 55 + 89 = 12^2$


 * The $4$th positive integer after $64, 96, 128$ with $6$ or more prime factors:
 * $144 = 2 \times 2 \times 2 \times 2 \times 3 \times 3$


 * The smallest positive integer which can be expressed as the sum of $2$ odd primes in $11$ ways.


 * The $20$th powerful number after $1, 4, 8, 9, 16, 25, 27, 32, 36, 49, 64, 72, 81, 100, 108, 121, 125, 128$

Also see

 * Square Fibonacci Number