135720128 has 28 divisors (see below), whose sum is σ = 269976600. Its totient is φ = 67694592.

The previous prime is 135720049. The next prime is 135720199. The reversal of 135720128 is 821027531.

It is a self number, because there is not a number n which added to its sum of digits gives 135720128.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26375 + ... + 31097.

Almost surely, 2^135720128 is an apocalyptic number.

It is an amenable number.

135720128 is a deficient number, since it is larger than the sum of its proper divisors (134256472).

135720128 is an equidigital number, since it uses as much as digits as its factorization.

135720128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5184 (or 5174 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 135720128 is about 11649.8981969801. The cubic root of 135720128 is about 513.9033162080.

Adding to 135720128 its reverse (821027531), we get a palindrome (956747659).

The spelling of 135720128 in words is "one hundred thirty-five million, seven hundred twenty thousand, one hundred twenty-eight".