128872686 has 8 divisors (see below), whose sum is σ = 257745384. Its totient is φ = 42957560.

The previous prime is 128872663. The next prime is 128872721. The reversal of 128872686 is 686278821.

It is a sphenic number, since it is the product of 3 distinct primes.

128872686 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10739385 + ... + 10739396.

It is an arithmetic number, because the mean of its divisors is an integer number (32218173).

Almost surely, 2^128872686 is an apocalyptic number.

128872686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

128872686 is a wasteful number, since it uses less digits than its factorization.

128872686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21478786.

The product of its digits is 516096, while the sum is 48.

The square root of 128872686 is about 11352.2106217247. The cubic root of 128872686 is about 505.1111554815. Note that the first 4 decimals are identical.

The spelling of 128872686 in words is "one hundred twenty-eight million, eight hundred seventy-two thousand, six hundred eighty-six".