Highly abundant numbers and several similar classes of numbers were first introduced by Pillai (1943), and early work on the subject was done by Alaoglu and Erdős (1944).
Subbayya Sivasankaranarayana Pillai (1901–1950) was an Nagercoil native Indian mathematician specializing in number theory.
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Subbayya Sivasankaranarayana Pillai was born to parents Subbayya Pillai and Gomati Ammal who were natives of Nagercoil.
Thakazhi Sivasankara Pillai | Changampuzha Krishna Pillai | V. Surendran Pillai | Pillai | Pattom A. Thanu Pillai | Palani Subramaniam Pillai | N. R. Pillai | Subbayya Sivasankaranarayana Pillai | S. Ramachandran Pillai | Rajan Pillai | P. Govinda Pillai | Dakshinamurthy Pillai | C. V. Raman Pillai | C. Muthiah Pillai |