728043891 has 8 divisors (see below), whose sum is σ = 971489280. Its totient is φ = 484980552.

The previous prime is 728043871. The next prime is 728043923. The reversal of 728043891 is 198340827.

728043891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 728043891 - 2¹³ = 728035699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728043821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91035 + ... + 98708.

It is an arithmetic number, because the mean of its divisors is an integer number (121436160).

Almost surely, 2^728043891 is an apocalyptic number.

728043891 is a deficient number, since it is larger than the sum of its proper divisors (243445389).

728043891 is a wasteful number, since it uses less digits than its factorization.

728043891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191025.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 728043891 is about 26982.2884685491. The cubic root of 728043891 is about 899.6063673683.

The spelling of 728043891 in words is "seven hundred twenty-eight million, forty-three thousand, eight hundred ninety-one".