728091 has 36 divisors (see below), whose sum is σ = 1327872. Its totient is φ = 381024.

The previous prime is 728087. The next prime is 728113. The reversal of 728091 is 190827.

728091 is nontrivially palindromic in base 16.

728091 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 728091 - 2² = 728087 is a prime.

It is a super-4 number, since 4×728091⁴ (a number of 25 digits) contains 4444 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728091.

It is not an unprimeable number, because it can be changed into a prime (728191) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5670 + ... + 5796.

2⁷²⁸⁰⁹¹ is an apocalyptic number.

728091 is a deficient number, since it is larger than the sum of its proper divisors (599781).

728091 is a wasteful number, since it uses less digits than its factorization.

728091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 728091 is about 853.2824854642. The cubic root of 728091 is about 89.9625770339.

The spelling of 728091 in words is "seven hundred twenty-eight thousand, ninety-one".