181328 has 20 divisors (see below), whose sum is σ = 401760. Its totient is φ = 77664.

The previous prime is 181303. The next prime is 181361. The reversal of 181328 is 823181.

181328 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

181328 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698 + ... + 921.

It is an arithmetic number, because the mean of its divisors is an integer number (20088).

2¹⁸¹³²⁸ is an apocalyptic number.

It is an amenable number.

181328 is an abundant number, since it is smaller than the sum of its proper divisors (220432).

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

181328 is a wasteful number, since it uses less digits than its factorization.

181328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634 (or 1628 counting only the distinct ones).

The product of its digits is 384, while the sum is 23.

The square root of 181328 is about 425.8262556489. The cubic root of 181328 is about 56.6006767390.

The spelling of 181328 in words is "one hundred eighty-one thousand, three hundred twenty-eight".