128135286 has 12 divisors (see below), whose sum is σ = 277626492. Its totient is φ = 42711756.

The previous prime is 128135269. The next prime is 128135299. The reversal of 128135286 is 682531821.

It is a happy number.

128135286 is a `hidden beast` number, since 128 + 1 + 3 + 528 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 128135286.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3559296 + ... + 3559331.

It is an arithmetic number, because the mean of its divisors is an integer number (23135541).

Almost surely, 2^128135286 is an apocalyptic number.

128135286 is an abundant number, since it is smaller than the sum of its proper divisors (149491206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128135286 is a wasteful number, since it uses less digits than its factorization.

128135286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7118635 (or 7118632 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 128135286 is about 11319.6857730239. The cubic root of 128135286 is about 504.1459091910.

The spelling of 128135286 in words is "one hundred twenty-eight million, one hundred thirty-five thousand, two hundred eighty-six".