Strong's #4001: pentakosioi (pronounced pen-tak-os'-ee-oy)
 from 4002 and 1540; five hundred:--five hundred.
Thayer's Greek Lexicon:
 ́ 
 
  pentakosioi 
 
 1) five hundred
 
  Part of Speech: adjective
Relation: from G4002 and G1540
 
Usage:
This word is used 2 times:
Luke 7:41: "the one owed  five hundred pence, and the other"
1 Corinthians 15:6: "After that, he was seen of above  five hundred brethren at once; of whom"