128886 has 8 divisors (see below), whose sum is σ = 257784. Its totient is φ = 42960.

The previous prime is 128879. The next prime is 128903. The reversal of 128886 is 688821.

128886 = 178² + 179² + ... + 181².

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

128886 is an admirable number.

It is a super-2 number, since 2×128886² = 33223201992, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 10735 + ... + 10746.

It is an arithmetic number, because the mean of its divisors is an integer number (32223).

2¹²⁸⁸⁸⁶ is an apocalyptic number.

128886 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.

128886 is a wasteful number, since it uses less digits than its factorization.

128886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21486.

The product of its digits is 6144, while the sum is 33.

The square root of 128886 is about 359.0069637208. The cubic root of 128886 is about 50.5128549440.

The spelling of 128886 in words is "one hundred twenty-eight thousand, eight hundred eighty-six".