<h2><a href="https://leetcode.com/problems/excel-sheet-column-title/">168. Excel Sheet Column Title</a></h2><h3>Easy</h3><hr><div><p>Given an integer <code>columnNumber</code>, return <em>its corresponding column title as it appears in an Excel sheet</em>.</p>

<p>For example:</p>

<pre>A -&gt; 1
B -&gt; 2
C -&gt; 3
...
Z -&gt; 26
AA -&gt; 27
AB -&gt; 28 
...
</pre>

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

<pre><strong>Input:</strong> columnNumber = 1
<strong>Output:</strong> "A"
</pre>

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

<pre><strong>Input:</strong> columnNumber = 28
<strong>Output:</strong> "AB"
</pre>

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

<pre><strong>Input:</strong> columnNumber = 701
<strong>Output:</strong> "ZY"
</pre>

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

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