Numbers can fall under more than one type of number.
The answer depends on how specific you want to be. #70# can be regarded as being any of the following types of numbers.
#70# is a #RR#eal number - it exists on the number line.
#70# is a Rational Number #QQ# - it can be written as a fraction such as #140/2, or 210/3#
#70# is an integer #ZZ# - it is a whole number without a fraction.
#70# is a "counting number" #NN_0# - it is equal to or greater than 0
#70# is a Natural Number #NN_0# it is equal to or greater than 1.
#70# is even because it is exactly divisible by #2#
#70# is a composite number (not prime) because it has more than #2# factors:
#F_70 = 1,2,5,7,10,14,35,70#
