  A positive integer $n$ is said to be a practical number if every integer in
$[1,n]$ can be represented as the sum of distinct divisors of $n$. In this
article, we consider practical numbers of a given polynomial form. We give a
necessary and sufficient condition on coefficients $a$ and $b$ for there to be
infinitely many practical numbers of the form $an+b$. We also give a necessary
and sufficient for a quadratic polynomial to contain infinitely many practical
numbers, using which we solve first part of a conjecture mentioned in [9]. In
the final section, we prove that every number of $8k+1$ form can be expressed
as a sum of a practical number and a square, and for every $j\in
\{0,\ldots,7\}\setminus \{1\}$ there are infinitely many natural numbers of
$8k+j$ form which cannot be written as sum of a square and a practical number.
