128128086 has 24 divisors (see below), whose sum is σ = 280310160. Its totient is φ = 42294096.

The previous prime is 128128073. The next prime is 128128093. The reversal of 128128086 is 680821821.

It is a self number, because there is not a number n which added to its sum of digits gives 128128086.

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 11 ways as a sum of consecutive naturals, for example, 32701 + ... + 36408.

It is an arithmetic number, because the mean of its divisors is an integer number (11679590).

Almost surely, 2^128128086 is an apocalyptic number.

128128086 is an abundant number, since it is smaller than the sum of its proper divisors (152182074).

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

128128086 is a wasteful number, since it uses less digits than its factorization.

128128086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69220 (or 69217 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 128128086 is about 11319.3677385267. The cubic root of 128128086 is about 504.1364662586.

The spelling of 128128086 in words is "one hundred twenty-eight million, one hundred twenty-eight thousand, eighty-six".