728489 has 2 divisors, whose sum is σ = 728490. Its totient is φ = 728488.

The previous prime is 728477. The next prime is 728521. The reversal of 728489 is 984827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652864 + 75625 = 808^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 728489 - 2¹² = 724393 is a prime.

It is not a weakly prime, because it can be changed into another prime (722489) 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, 364244 + 364245.

It is an arithmetic number, because the mean of its divisors is an integer number (364245).

2⁷²⁸⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

728489 is a deficient number, since it is larger than the sum of its proper divisors (1).

728489 is an equidigital number, since it uses as much as digits as its factorization.

728489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 728489 is about 853.5156706236. The cubic root of 728489 is about 89.9789662780.

The spelling of 728489 in words is "seven hundred twenty-eight thousand, four hundred eighty-nine".