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 RReal 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