28533569 has 2 divisors, whose sum is σ = 28533570. Its totient is φ = 28533568.

The previous prime is 28533509. The next prime is 28533613. The reversal of 28533569 is 96533582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21270544 + 7263025 = 4612^2 + 2695^2 .

It is a cyclic number.

It is not a de Polignac number, because 28533569 - 2²⁰ = 27484993 is a prime.

It is a super-2 number, since 2×28533569² = 1628329119755522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28533509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14266784 + 14266785.

It is an arithmetic number, because the mean of its divisors is an integer number (14266785).

Almost surely, 2^28533569 is an apocalyptic number.

It is an amenable number.

28533569 is a deficient number, since it is larger than the sum of its proper divisors (1).

28533569 is an equidigital number, since it uses as much as digits as its factorization.

28533569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 41.

The square root of 28533569 is about 5341.6822256664. The cubic root of 28533569 is about 305.5756181550.

The spelling of 28533569 in words is "twenty-eight million, five hundred thirty-three thousand, five hundred sixty-nine".