231728 has 20 divisors (see below), whose sum is σ = 513360. Its totient is φ = 99264.

The previous prime is 231719. The next prime is 231779. The reversal of 231728 is 827132.

It is an unprimeable number.

231728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 923 + ... + 1146.

It is an arithmetic number, because the mean of its divisors is an integer number (25668).

2²³¹⁷²⁸ is an apocalyptic number.

231728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

231728 is an abundant number, since it is smaller than the sum of its proper divisors (281632).

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

231728 is a wasteful number, since it uses less digits than its factorization.

231728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084 (or 2078 counting only the distinct ones).

The product of its digits is 672, while the sum is 23.

The square root of 231728 is about 481.3813457125. The cubic root of 231728 is about 61.4223136122.

It can be divided in two parts, 231 and 728, that added together give a palindrome (959).

The spelling of 231728 in words is "two hundred thirty-one thousand, seven hundred twenty-eight".