<Table> <Tr> <Th_colspan="2"> Constitution of India </Th> </Tr> <Tr> <Td_colspan="2"> The original text of the Preamble </Td> </Tr> <Tr> <Th> Ratified </Th> <Td> 26 November 1949 </Td> </Tr> <Tr> <Th> Date effective </Th> <Td> January 26, 1950; 68 years ago (1950 - 01 - 26) </Td> </Tr> <Tr> <Th> Author (s) </Th> <Td> B.R. Ambedkar and Drafting committee of the Constituent Assembly of India </Td> </Tr> <Tr> <Th> Signatories </Th> <Td> 284 members of the Constituent Assembly </Td> </Tr> <Tr> <Th> Purpose </Th> <Td> To replace the Indian Independence Act </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Constitution of India </Th> </Tr>

List out the salient features of the indian constitution