This plugin will display an image showing the number of comments on a post at the bottom of each feed item (RSS|Atom|etc) that links to the comments section of that post. 
You are able to choose which colors to use for the background of the image and the color of the text as well. 
The reason you would want to use an image instead of plain text is because RSS feeds are generally only updated if the build-date or modification-date components are changed, which does not happen if someone leaves a new comment. This will allow the comment number to update dynamically, regardless of when it’s been first viewed by a user.
You’re able to set the colors of the text and the background in the standard 6 character hex format. 
You may also supply formats for what will show if there are zero comments on your post or more. 
I just added the option to include the image link in the feed excerpts as well. (called by <code>the_excerpt_rss</code> function)
Two Font files are included with the plugin, Arial and SenateBold. You can set which of the two you would like to use, or optionally upload your own .ttf font file to use to render the text on the image.
This requires the GD Image library extension in PHP to function. To check whether or not your server has this use the <code><?php php_info(); ?></code> function and it should be listed.

Feed Comments Number

Add an image that displays the number of comments to your feed items.

creative-storming

CST One Click Disable Comments and RSS Feed allows you to globally disable comments on pages, posts, attachments and any post type in one click. It’s simple and powerful.
It also removes all comment-related sections from admin panel and website frontend.
If you find any issues, errors, or if you want to suggest new features to implement in later versions, use the appropriate 
support form before issuing a negative comment so that we can resolve it.
We’ve included support links within the plugin settings page to make bug reporting easier
DETAILS
CST One Click Disable Comments and RSS Feed provide one option to completely disable the commenting feature in WordPress. 
When you enable this option:
<ul>
<li>All comments box from frontend website are hidden (in their place wordpress inserts the saying “Comments are closed”);</li>
<li>All comment related widgets are disabled;</li>
<li>All comments links in Admin Menu are hidden;</li>
<li>All comments links in Admin Bar are hidden;</li>
<li>All comments related metabox “Recent Comments”, “Discussion” etc. are hidden from the WordPress Dashboard;</li>
<li>Comments settings page will be hidden;</li>
<li>All existing comments will be hidden</li>
<li>All comments and trackbacks for any post type are hidden</li>
<li>Any user trying to access comments page is redirected to the admin dashboard</li>
</ul>
CST One Click Disable Comments and RSS Feed provide an additional option to hide the saying “Comments are closed” from website frontend.
CST One Click Disable Comments and RSS Feed provide another additional option to completely disable the RSS Feed from your website 
When you enable this option:
<ul>
<li>All RSS/Atom feeds are disabled (and requests for these will show an error message);</li>
<li>All pingbacks are disabled;</li>
<li>The Pingback HTTP header is removed from header section;</li>
<li>The RSS Feed HTTP header is removed from header section;</li>
</ul>
CST One Click Disable Comments disable all comments in your website, but in some cases there are issues that can overcome 
this limitation, in which case just disable CST One Click Disable Comments plugin (because it hide comment menu ^_^), delete all existing comments and re-enable this plugin.
As the name says, this plugin disables any comment system in one click, so it is not indicated if you need selective comment management (native wordpress feature)

CST One Click Disable Comments and RSS Feed

One click to disable the entire comment system and RSS feeds. Allows you to hide all references to comments on the site.

Feed Comments Number vs CST One Click Disable Comments and RSS Feed