The Number of the Companions
There is no definite knowledge about the number of the Companions who were alive when the Prophet (pbuh) died but it is stated that the number is more than 100.000. For instance, 40.000 Companions took part in Farewell Hajj and 70.000 Companions took part in the Expedition of Tabuk. Imam Shafii says there are 60.000 Companions who saw the Prophet (pbuh) and reported hadiths from him. However, the names of the Companions who died beforehand and those who went to distant places during the conquest of Makkah could not be recorded fully. The person to record the most Companions is Ibn Hajar; he recorded 11.783 names in his book al-Isaba.