728843491 has 4 divisors (see below), whose sum is σ = 729999184. Its totient is φ = 727687800.

The previous prime is 728843443. The next prime is 728843503. The reversal of 728843491 is 194348827.

728843491 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.

It is a cyclic number.

It is not a de Polignac number, because 728843491 - 2⁹ = 728842979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728843411) 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, 576900 + ... + 578161.

It is an arithmetic number, because the mean of its divisors is an integer number (182499796).

Almost surely, 2^728843491 is an apocalyptic number.

728843491 is a deficient number, since it is larger than the sum of its proper divisors (1155693).

728843491 is a wasteful number, since it uses less digits than its factorization.

728843491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155692.

The product of its digits is 387072, while the sum is 46.

The square root of 728843491 is about 26997.1015296087. The cubic root of 728843491 is about 899.9355883944.

The spelling of 728843491 in words is "seven hundred twenty-eight million, eight hundred forty-three thousand, four hundred ninety-one".