28056569 has 2 divisors, whose sum is σ = 28056570. Its totient is φ = 28056568.

The previous prime is 28056547. The next prime is 28056583. The reversal of 28056569 is 96565082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21270544 + 6786025 = 4612^2 + 2605^2 .

It is a cyclic number.

It is not a de Polignac number, because 28056569 - 2⁸ = 28056313 is a prime.

It is a super-2 number, since 2×28056569² = 1574342128103522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28056599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028284 + 14028285.

It is an arithmetic number, because the mean of its divisors is an integer number (14028285).

Almost surely, 2^28056569 is an apocalyptic number.

It is an amenable number.

28056569 is a deficient number, since it is larger than the sum of its proper divisors (1).

28056569 is an equidigital number, since it uses as much as digits as its factorization.

28056569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 28056569 is about 5296.8451931315. The cubic root of 28056569 is about 303.8632558182.

The spelling of 28056569 in words is "twenty-eight million, fifty-six thousand, five hundred sixty-nine".