28789569 has 6 divisors (see below), whose sum is σ = 41584946. Its totient is φ = 19193040.

The previous prime is 28789567. The next prime is 28789571. The reversal of 28789569 is 96598782.

It is a happy number.

28789569 is a `hidden beast` number, since 2 + 8 + 78 + 9 + 569 = 666.

It is an interprime number because it is at equal distance from previous prime (28789567) and next prime (28789571).

It can be written as a sum of positive squares in only one way, i.e., 22439169 + 6350400 = 4737^2 + 2520^2 .

It is not a de Polignac number, because 28789569 - 2¹ = 28789567 is a prime.

It is a super-2 number, since 2×28789569² = 1657678566411522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28789567) 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, 1599412 + ... + 1599429.

Almost surely, 2^28789569 is an apocalyptic number.

It is an amenable number.

28789569 is a deficient number, since it is larger than the sum of its proper divisors (12795377).

28789569 is a wasteful number, since it uses less digits than its factorization.

28789569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198847 (or 3198844 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 28789569 is about 5365.5912069408. The cubic root of 28789569 is about 306.4867621291.

The spelling of 28789569 in words is "twenty-eight million, seven hundred eighty-nine thousand, five hundred sixty-nine".