28688589 has 6 divisors (see below), whose sum is σ = 41439086. Its totient is φ = 19125720.

The previous prime is 28688587. The next prime is 28688593. The reversal of 28688589 is 98588682.

It can be written as a sum of positive squares in only one way, i.e., 26347689 + 2340900 = 5133^2 + 1530^2 .

It is not a de Polignac number, because 28688589 - 2¹ = 28688587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28688587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1593802 + ... + 1593819.

Almost surely, 2^28688589 is an apocalyptic number.

It is an amenable number.

28688589 is a deficient number, since it is larger than the sum of its proper divisors (12750497).

28688589 is a wasteful number, since it uses less digits than its factorization.

28688589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3187627 (or 3187624 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 54.

The square root of 28688589 is about 5356.1729807765. The cubic root of 28688589 is about 306.1280061655.

The spelling of 28688589 in words is "twenty-eight million, six hundred eighty-eight thousand, five hundred eighty-nine".