1328728589 has 2 divisors, whose sum is σ = 1328728590. Its totient is φ = 1328728588.

The previous prime is 1328728573. The next prime is 1328728631. The reversal of 1328728589 is 9858278231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 767844100 + 560884489 = 27710^2 + 23683^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328728589 - 2⁴ = 1328728573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1328728589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328728519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664364294 + 664364295.

It is an arithmetic number, because the mean of its divisors is an integer number (664364295).

Almost surely, 2^1328728589 is an apocalyptic number.

It is an amenable number.

1328728589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328728589 is an equidigital number, since it uses as much as digits as its factorization.

1328728589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 53.

The square root of 1328728589 is about 36451.7295748775. The cubic root of 1328728589 is about 1099.3739106572.

The spelling of 1328728589 in words is "one billion, three hundred twenty-eight million, seven hundred twenty-eight thousand, five hundred eighty-nine".