181128 has 16 divisors (see below), whose sum is σ = 452880. Its totient is φ = 60368.

The previous prime is 181123. The next prime is 181141. The reversal of 181128 is 821181.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (181123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3750 + ... + 3797.

It is an arithmetic number, because the mean of its divisors is an integer number (28305).

2¹⁸¹¹²⁸ is an apocalyptic number.

It is an amenable number.

181128 is an abundant number, since it is smaller than the sum of its proper divisors (271752).

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

181128 is a wasteful number, since it uses less digits than its factorization.

181128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7556 (or 7552 counting only the distinct ones).

The product of its digits is 128, while the sum is 21.

The square root of 181128 is about 425.5913532956. The cubic root of 181128 is about 56.5798593991.

The spelling of 181128 in words is "one hundred eighty-one thousand, one hundred twenty-eight".