How to check your oracle is 32 bit or 64 bit?

root@nwtgz # su - oracle
Sun Microsystems Inc.   SunOS 5.8--NWT GZ       Generic Patch   February 2004
h:w$ which oracle
/opt/orahome/app/oracle92/product/9.2.0.1.0/bin/oracle
h:w$ file `which oracle`
/opt/orahome/app/oracle92/product/9.2.0.1.0/bin/oracle: ELF 64-bit MSB executable SPARCV9 Version 1, dynamically linked, not stripped