From How do you remove Disqus "comments" from Tumblr pages? and Disqus: Setup instructions for Tumblr, I found that you can show Disqus comments with
<a class="dsq-comment-count" href="{Permalink}#disqus_thread">Comments</a>
which seems to generate "x Comments" where x is the number of comments. Is there a way to get rid of the "Comments" bit, and just have the number?