There are 1,028 hymns (sūkta) in the Rigveda. Most of these hymns are dedicated to specific deities.
The most prominent deity is Indra; Agni the sacrificial fire and messenger of the gods; and Soma, the ritual drink dedicated to Indra, are additional principal deities.[1][2]
Deities by prominence
List of Rigvedic deities by a number of dedicated hymns, after Griffith.[3] Some dedications are to paired deities, such as Indra-Agni, Mitra-Varuna, Soma-Rudra, here counted double. Visvedevas (all gods and goddesses together) have been invoked 70 times.
^Seth, Noel (2010). "Man's Relation to God in the Varuna Hymns". In Menachery, George (ed.). St. Thomas Christian Encyclopaedia of India. Vol. III. pp. 4 ff.
Sources
Sri Aurobindo (1998), The Secret of Veda(PDF), The Complete Works of Sri Aurobindo, vol. 15, Pondicherry: Sri Aurobindo Ashram Press