Following the work of logicians like Godehard Link and linguists like Manfred Krifka, we know that the mass/count distinction can be given a precise mathematical definition in terms of notions like cumulativity and quantization.
Count | Count Basie | count | Count Dracula | The Count of Monte Cristo | Imperial Count | Count of Flanders | Count of Barcelona | Count Basie Orchestra | Gaspar de Guzmán, Count-Duke of Olivares | Count of Soissons | You Can Count on Me | noun | Jean-Frédéric Phélypeaux, Count of Maurepas | Count Palatine | Count palatine | Count of Paris | John II, Count of Rietberg | Count of Nevers | count of Blois | William I, Count of Nassau-Dillenburg | Simon VI, Count of Lippe | Ramon Berenguer II, Count of Barcelona | Ramon Berenguer I, Count of Barcelona | Prince Gaston, Count of Eu | Peter II, Count of Savoy | Juan Vicente de Güemes, 2nd Count of Revillagigedo | Gustav Horn, Count of Pori | Gilbert, Count of Gravina | Gebhard, Count of the Lahngau |
In one sense, datum is a count noun with the plural datums (see usage in datum article) that can be used with cardinal numbers (e.g. "80 datums"); data (originally a Latin plural) is not used like a normal count noun with cardinal numbers and can be plural with such plural determiners as these and many or as a singular abstract mass noun with a verb in the singular form.