128818 has 8 divisors (see below), whose sum is σ = 199980. Its totient is φ = 62160.

The previous prime is 128813. The next prime is 128819. The reversal of 128818 is 818821.

It can be written as a sum of positive squares in 2 ways, for example, as 127449 + 1369 = 357^2 + 37^2 .

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

It is not an unprimeable number, because it can be changed into a prime (128813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053 + ... + 1168.

2¹²⁸⁸¹⁸ is an apocalyptic number.

128818 is a deficient number, since it is larger than the sum of its proper divisors (71162).

128818 is a wasteful number, since it uses less digits than its factorization.

128818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2252.

The product of its digits is 1024, while the sum is 28.

The square root of 128818 is about 358.9122455420. The cubic root of 128818 is about 50.5039698869.

It can be divided in two parts, 128 and 818, that added together give a triangular number (946 = T₄₃).

The spelling of 128818 in words is "one hundred twenty-eight thousand, eight hundred eighteen".