728224169 has 2 divisors, whose sum is σ = 728224170. Its totient is φ = 728224168.

The previous prime is 728224151. The next prime is 728224177. The reversal of 728224169 is 961422827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 708198544 + 20025625 = 26612^2 + 4475^2 .

It is an emirp because it is prime and its reverse (961422827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728224169 - 2⁸ = 728223913 is a prime.

It is a super-2 number, since 2×728224169² = 1060620880631481122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (728224109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364112084 + 364112085.

It is an arithmetic number, because the mean of its divisors is an integer number (364112085).

Almost surely, 2^728224169 is an apocalyptic number.

It is an amenable number.

728224169 is a deficient number, since it is larger than the sum of its proper divisors (1).

728224169 is an equidigital number, since it uses as much as digits as its factorization.

728224169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 41.

The square root of 728224169 is about 26985.6289346756. The cubic root of 728224169 is about 899.6806146558.

The spelling of 728224169 in words is "seven hundred twenty-eight million, two hundred twenty-four thousand, one hundred sixty-nine".