28238569 has 2 divisors, whose sum is σ = 28238570. Its totient is φ = 28238568.

The previous prime is 28238563. The next prime is 28238591. The reversal of 28238569 is 96583282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27962944 + 275625 = 5288^2 + 525^2 .

It is a cyclic number.

It is not a de Polignac number, because 28238569 - 2⁵ = 28238537 is a prime.

It is a super-2 number, since 2×28238569² = 1594833558335522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28238563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14119284 + 14119285.

It is an arithmetic number, because the mean of its divisors is an integer number (14119285).

Almost surely, 2^28238569 is an apocalyptic number.

It is an amenable number.

28238569 is a deficient number, since it is larger than the sum of its proper divisors (1).

28238569 is an equidigital number, since it uses as much as digits as its factorization.

28238569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 28238569 is about 5313.9974595402. The cubic root of 28238569 is about 304.5188831432.

The spelling of 28238569 in words is "twenty-eight million, two hundred thirty-eight thousand, five hundred sixty-nine".