28668589 has 2 divisors, whose sum is σ = 28668590. Its totient is φ = 28668588.

The previous prime is 28668571. The next prime is 28668667. The reversal of 28668589 is 98586682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22705225 + 5963364 = 4765^2 + 2442^2 .

It is a cyclic number.

It is not a de Polignac number, because 28668589 - 2⁹ = 28668077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28668509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14334294 + 14334295.

It is an arithmetic number, because the mean of its divisors is an integer number (14334295).

Almost surely, 2^28668589 is an apocalyptic number.

It is an amenable number.

28668589 is a deficient number, since it is larger than the sum of its proper divisors (1).

28668589 is an equidigital number, since it uses as much as digits as its factorization.

28668589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 52.

The square root of 28668589 is about 5354.3056505956. The cubic root of 28668589 is about 306.0568514701.

The spelling of 28668589 in words is "twenty-eight million, six hundred sixty-eight thousand, five hundred eighty-nine".