Number Line (Chester, Beverly, Luke, Ryan & Bryan Goh

φ (Phi)

The 21st number of the Greek alphabet

The golden ratio  in mathematics, art, and architecture.

4

positive number

smallest composite number

whole number 

even number

13

prime number

positive number

whole number 

odd number

27

composite number

sum of two perfect squares(25 and 2)

whole number 

odd number

perfect cube

positive number

real number

composite number