135638428 has 12 divisors (see below), whose sum is σ = 242417952. Its totient is φ = 66376160.

The previous prime is 135638417. The next prime is 135638431. The reversal of 135638428 is 824836531.

It is a super-2 number, since 2×135638428² = 36795566300622368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360553 + ... + 360928.

It is an arithmetic number, because the mean of its divisors is an integer number (20201496).

Almost surely, 2^135638428 is an apocalyptic number.

It is an amenable number.

135638428 is a deficient number, since it is larger than the sum of its proper divisors (106779524).

135638428 is a wasteful number, since it uses less digits than its factorization.

135638428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721532 (or 721530 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 135638428 is about 11646.3912007111. The cubic root of 135638428 is about 513.8001766831.

The spelling of 135638428 in words is "one hundred thirty-five million, six hundred thirty-eight thousand, four hundred twenty-eight".