128135712 has 24 divisors (see below), whose sum is σ = 336356496. Its totient is φ = 42711872.

The previous prime is 128135663. The next prime is 128135797. The reversal of 128135712 is 217531821.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 128135712.

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, 667278 + ... + 667469.

It is an arithmetic number, because the mean of its divisors is an integer number (14014854).

Almost surely, 2^128135712 is an apocalyptic number.

128135712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128135712 is an abundant number, since it is smaller than the sum of its proper divisors (208220784).

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

128135712 is a wasteful number, since it uses less digits than its factorization.

128135712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334760 (or 1334752 counting only the distinct ones).

The product of its digits is 3360, while the sum is 30.

The square root of 128135712 is about 11319.7045897850. The cubic root of 128135712 is about 504.1464678867.

The spelling of 128135712 in words is "one hundred twenty-eight million, one hundred thirty-five thousand, seven hundred twelve".