111728 has 10 divisors (see below), whose sum is σ = 216504. Its totient is φ = 55856.

The previous prime is 111721. The next prime is 111731. The reversal of 111728 is 827111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3476 + ... + 3507.

2¹¹¹⁷²⁸ is an apocalyptic number.

It is an amenable number.

111728 is a deficient number, since it is larger than the sum of its proper divisors (104776).

111728 is an equidigital number, since it uses as much as digits as its factorization.

111728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6991 (or 6985 counting only the distinct ones).

The product of its digits is 112, while the sum is 20.

The square root of 111728 is about 334.2573858571. The cubic root of 111728 is about 48.1637923012.

Adding to 111728 its reverse (827111), we get a palindrome (938839).

It can be divided in two parts, 111 and 728, that multiplied together give a palindrome (80808).

The spelling of 111728 in words is "one hundred eleven thousand, seven hundred twenty-eight".