128311712 has 24 divisors (see below), whose sum is σ = 265910400. Its totient is φ = 60778944.

The previous prime is 128311709. The next prime is 128311723. The reversal of 128311712 is 217113821.

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, 104912 + ... + 106127.

It is an arithmetic number, because the mean of its divisors is an integer number (11079600).

Almost surely, 2^128311712 is an apocalyptic number.

It is an amenable number.

128311712 is an abundant number, since it is smaller than the sum of its proper divisors (137598688).

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

128311712 is a wasteful number, since it uses less digits than its factorization.

128311712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211068 (or 211060 counting only the distinct ones).

The product of its digits is 672, while the sum is 26.

The square root of 128311712 is about 11327.4759765801. The cubic root of 128311712 is about 504.3771846874.

The spelling of 128311712 in words is "one hundred twenty-eight million, three hundred eleven thousand, seven hundred twelve".