<span class="fa-stack fa-5x has-badge" data-count="8,888,888">
  <i class="fa fa-circle fa-stack-2x"></i>
  <i class="fa fa-bell fa-stack-1x fa-inverse"></i>
</span>

.fa-stack[data-count]:after{
  position:absolute;
  right:0%;
  top:1%;
  content: attr(data-count);
  font-size:30%;
  padding:.6em;
  border-radius:999px;
  line-height:.75em;
  color: white;
  background:rgba(255,0,0,.85);
  text-align:center;
  min-width:2em;
  font-weight:bold;
}