128885 has 8 divisors (see below), whose sum is σ = 156600. Its totient is φ = 101824.

The previous prime is 128879. The next prime is 128903. The reversal of 128885 is 588821.

It can be written as a sum of positive squares in 4 ways, for example, as 14641 + 114244 = 121^2 + 338^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 128885 - 2⁸ = 128629 is a prime.

It is a super-2 number, since 2×128885² = 33222686450, 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 7 ways as a sum of consecutive naturals, for example, 659 + ... + 831.

It is an arithmetic number, because the mean of its divisors is an integer number (19575).

2¹²⁸⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

128885 is a deficient number, since it is larger than the sum of its proper divisors (27715).

128885 is a wasteful number, since it uses less digits than its factorization.

128885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327.

The product of its digits is 5120, while the sum is 32.

The square root of 128885 is about 359.0055709874. The cubic root of 128885 is about 50.5127243040.

The spelling of 128885 in words is "one hundred twenty-eight thousand, eight hundred eighty-five".