<h2><a href="https://leetcode.com/problems/integer-to-english-words/">273. Integer to English Words</a></h2><h3>Hard</h3><hr><div><p>Convert a non-negative integer <code>num</code> to its English words representation.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre><strong>Input:</strong> num = 123
<strong>Output:</strong> "One Hundred Twenty Three"
</pre>

<p><strong class="example">Example 2:</strong></p>

<pre><strong>Input:</strong> num = 12345
<strong>Output:</strong> "Twelve Thousand Three Hundred Forty Five"
</pre>

<p><strong class="example">Example 3:</strong></p>

<pre><strong>Input:</strong> num = 1234567
<strong>Output:</strong> "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven"
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>0 &lt;= num &lt;= 2<sup>31</sup> - 1</code></li>
</ul>
</div>