128135828 has 12 divisors (see below), whose sum is σ = 225743700. Its totient is φ = 63637632.

The previous prime is 128135797. The next prime is 128135837. The reversal of 128135828 is 828531821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6210064 + 121925764 = 2492^2 + 11042^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128135791 and 128135800.

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, 106901 + ... + 108092.

It is an arithmetic number, because the mean of its divisors is an integer number (18811975).

Almost surely, 2^128135828 is an apocalyptic number.

It is an amenable number.

128135828 is a deficient number, since it is larger than the sum of its proper divisors (97607872).

128135828 is a wasteful number, since it uses less digits than its factorization.

128135828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215146 (or 215144 counting only the distinct ones).

The product of its digits is 30720, while the sum is 38.

The square root of 128135828 is about 11319.7097135925. The cubic root of 128135828 is about 504.1466200196.

The spelling of 128135828 in words is "one hundred twenty-eight million, one hundred thirty-five thousand, eight hundred twenty-eight".