Abstract. Let x denote the number of those integers n with ' n 6 x, where ' denotes the Euler function. Improving on a well-known estimate of Bateman (1972), we show that x ,Ax R x , where A = 2 3 = 6 and R x is essentially of the size of the best available estimate for the remainder term in the prime number theorem.Mathematics Subject Classifications (1991). 11N25, 11N37, 11L07.