728591197 has 4 divisors (see below), whose sum is σ = 746361756. Its totient is φ = 710820640.

The previous prime is 728591191. The next prime is 728591251. The reversal of 728591197 is 791195827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110124036 + 618467161 = 10494^2 + 24869^2 .

It is a cyclic number.

It is not a de Polignac number, because 728591197 - 2³ = 728591189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 728591197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728591191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8885218 + ... + 8885299.

It is an arithmetic number, because the mean of its divisors is an integer number (186590439).

Almost surely, 2^728591197 is an apocalyptic number.

It is an amenable number.

728591197 is a deficient number, since it is larger than the sum of its proper divisors (17770559).

728591197 is a wasteful number, since it uses less digits than its factorization.

728591197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17770558.

The product of its digits is 317520, while the sum is 49.

The square root of 728591197 is about 26992.4285124551. The cubic root of 728591197 is about 899.8317368564.

The spelling of 728591197 in words is "seven hundred twenty-eight million, five hundred ninety-one thousand, one hundred ninety-seven".