728388111 has 16 divisors (see below), whose sum is σ = 1063918080. Its totient is φ = 439595520.

The previous prime is 728388091. The next prime is 728388119. The reversal of 728388111 is 111883827.

728388111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 728388111 - 2⁹ = 728387599 is a prime.

It is a super-2 number, since 2×728388111² = 1061098480492296642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 728388111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728388119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38290 + ... + 54063.

It is an arithmetic number, because the mean of its divisors is an integer number (66494880).

Almost surely, 2^728388111 is an apocalyptic number.

728388111 is a deficient number, since it is larger than the sum of its proper divisors (335529969).

728388111 is a wasteful number, since it uses less digits than its factorization.

728388111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92606.

The product of its digits is 21504, while the sum is 39.

The square root of 728388111 is about 26988.6663434857. Note that the first 3 decimals coincide. The cubic root of 728388111 is about 899.7481233428.

The spelling of 728388111 in words is "seven hundred twenty-eight million, three hundred eighty-eight thousand, one hundred eleven".