728111 has 4 divisors (see below), whose sum is σ = 759792. Its totient is φ = 696432.

The previous prime is 728087. The next prime is 728113. The reversal of 728111 is 111827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728111 - 2⁶ = 728047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728113) 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, 15806 + ... + 15851.

It is an arithmetic number, because the mean of its divisors is an integer number (189948).

2⁷²⁸¹¹¹ is an apocalyptic number.

728111 is a deficient number, since it is larger than the sum of its proper divisors (31681).

728111 is a wasteful number, since it uses less digits than its factorization.

728111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31680.

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

The square root of 728111 is about 853.2942048321. The cubic root of 728111 is about 89.9634007565.

Adding to 728111 its reverse (111827), we get a palindrome (839938).

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

The spelling of 728111 in words is "seven hundred twenty-eight thousand, one hundred eleven".