28565869 has 2 divisors, whose sum is σ = 28565870. Its totient is φ = 28565868.

The previous prime is 28565863. The next prime is 28565891. The reversal of 28565869 is 96856582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24383844 + 4182025 = 4938^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 28565869 - 2⁷ = 28565741 is a prime.

It is a super-2 number, since 2×28565869² = 1632017743450322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28565863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14282934 + 14282935.

It is an arithmetic number, because the mean of its divisors is an integer number (14282935).

Almost surely, 2^28565869 is an apocalyptic number.

It is an amenable number.

28565869 is a deficient number, since it is larger than the sum of its proper divisors (1).

28565869 is an equidigital number, since it uses as much as digits as its factorization.

28565869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1036800, while the sum is 49.

The square root of 28565869 is about 5344.7047626600. The cubic root of 28565869 is about 305.6908785405.

The spelling of 28565869 in words is "twenty-eight million, five hundred sixty-five thousand, eight hundred sixty-nine".