138128764 has 6 divisors (see below), whose sum is σ = 241725344. Its totient is φ = 69064380.

The previous prime is 138128737. The next prime is 138128779. The reversal of 138128764 is 467821831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17266092 + ... + 17266099.

Almost surely, 2^138128764 is an apocalyptic number.

It is an amenable number.

138128764 is a deficient number, since it is larger than the sum of its proper divisors (103596580).

138128764 is a wasteful number, since it uses less digits than its factorization.

138128764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34532195 (or 34532193 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 138128764 is about 11752.8194064233. The cubic root of 138128764 is about 516.9256016465.

The spelling of 138128764 in words is "one hundred thirty-eight million, one hundred twenty-eight thousand, seven hundred sixty-four".