28547569 has 2 divisors, whose sum is σ = 28547570. Its totient is φ = 28547568.

The previous prime is 28547567. The next prime is 28547593. The reversal of 28547569 is 96574582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24137569 + 4410000 = 4913^2 + 2100^2 .

It is a cyclic number.

It is not a de Polignac number, because 28547569 - 2¹ = 28547567 is a prime.

It is a super-2 number, since 2×28547569² = 1629927391619522, which contains 22 as substring.

Together with 28547567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28547567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14273784 + 14273785.

It is an arithmetic number, because the mean of its divisors is an integer number (14273785).

Almost surely, 2^28547569 is an apocalyptic number.

It is an amenable number.

28547569 is a deficient number, since it is larger than the sum of its proper divisors (1).

28547569 is an equidigital number, since it uses as much as digits as its factorization.

28547569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 46.

The square root of 28547569 is about 5342.9925135639. The cubic root of 28547569 is about 305.6255868914.

The spelling of 28547569 in words is "twenty-eight million, five hundred forty-seven thousand, five hundred sixty-nine".