728869 has 2 divisors, whose sum is σ = 728870. Its totient is φ = 728868.

The previous prime is 728867. The next prime is 728873. The reversal of 728869 is 968827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 580644 + 148225 = 762^2 + 385^2 .

It is an emirp because it is prime and its reverse (968827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728869 - 2¹ = 728867 is a prime.

It is a super-2 number, since 2×728869² = 1062500038322, which contains 22 as substring.

Together with 728867, it forms a pair of twin primes.

728869 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364434 + 364435.

It is an arithmetic number, because the mean of its divisors is an integer number (364435).

2⁷²⁸⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

728869 is a deficient number, since it is larger than the sum of its proper divisors (1).

728869 is an equidigital number, since it uses as much as digits as its factorization.

728869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 728869 is about 853.7382502852. The cubic root of 728869 is about 89.9946087306.

The spelling of 728869 in words is "seven hundred twenty-eight thousand, eight hundred sixty-nine".