728193161 has 8 divisors (see below), whose sum is σ = 758106120. Its totient is φ = 698600448.

The previous prime is 728193149. The next prime is 728193187. The reversal of 728193161 is 161391827.

728193161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 154878025 + 573315136 = 12445^2 + 23944^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 728193161 - 2¹⁴ = 728176777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728183161) 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, 75416 + ... + 84521.

It is an arithmetic number, because the mean of its divisors is an integer number (94763265).

Almost surely, 2^728193161 is an apocalyptic number.

It is an amenable number.

728193161 is a deficient number, since it is larger than the sum of its proper divisors (29912959).

728193161 is a wasteful number, since it uses less digits than its factorization.

728193161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160123.

The product of its digits is 18144, while the sum is 38.

The square root of 728193161 is about 26985.0544005381. The cubic root of 728193161 is about 899.6678449192.

The spelling of 728193161 in words is "seven hundred twenty-eight million, one hundred ninety-three thousand, one hundred sixty-one".