728043091 has 4 divisors (see below), whose sum is σ = 751528384. Its totient is φ = 704557800.

The previous prime is 728043077. The next prime is 728043119. The reversal of 728043091 is 190340827.

728043091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190340827 = 277 ⋅687151.

It is a cyclic number.

It is not a de Polignac number, because 728043091 - 2⁵ = 728043059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728043011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11742600 + ... + 11742661.

It is an arithmetic number, because the mean of its divisors is an integer number (187882096).

Almost surely, 2^728043091 is an apocalyptic number.

728043091 is a deficient number, since it is larger than the sum of its proper divisors (23485293).

728043091 is a wasteful number, since it uses less digits than its factorization.

728043091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23485292.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 728043091 is about 26982.2736440056. The cubic root of 728043091 is about 899.6060378619.

The spelling of 728043091 in words is "seven hundred twenty-eight million, forty-three thousand, ninety-one".