28865563 has 2 divisors, whose sum is σ = 28865564. Its totient is φ = 28865562.

The previous prime is 28865537. The next prime is 28865581. The reversal of 28865563 is 36556882.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28865563 - 2⁹ = 28865051 is a prime.

It is not a weakly prime, because it can be changed into another prime (28865533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14432781 + 14432782.

It is an arithmetic number, because the mean of its divisors is an integer number (14432782).

Almost surely, 2^28865563 is an apocalyptic number.

28865563 is a deficient number, since it is larger than the sum of its proper divisors (1).

28865563 is an equidigital number, since it uses as much as digits as its factorization.

28865563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 43.

The square root of 28865563 is about 5372.6681453445. The cubic root of 28865563 is about 306.7561964232.

The spelling of 28865563 in words is "twenty-eight million, eight hundred sixty-five thousand, five hundred sixty-three".