THE EULER'S NUMBER E #rolandoasisten || CALCULUS | PRECALCULUS | VIDEO NO. 29 The number e, or the Euler's number e, is one of the most important and beautiful constants in math. It has its special properties that make it a suitable number to express continuous growth and decay. All exponential functions are proportional to their derivatives, but e alone has that proportionality equal to one. That makes it one of the most suitable constants in our study of calculus. The number e is an irrational