28018563 has 4 divisors (see below), whose sum is σ = 37358088. Its totient is φ = 18679040.

The previous prime is 28018541. The next prime is 28018579. The reversal of 28018563 is 36581082.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28018563 - 2⁸ = 28018307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28018763) 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 in 3 ways as a sum of consecutive naturals, for example, 4669758 + ... + 4669763.

It is an arithmetic number, because the mean of its divisors is an integer number (9339522).

Almost surely, 2^28018563 is an apocalyptic number.

28018563 is a deficient number, since it is larger than the sum of its proper divisors (9339525).

28018563 is an equidigital number, since it uses as much as digits as its factorization.

28018563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9339524.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28018563 is about 5293.2563701374. The cubic root of 28018563 is about 303.7259873649.

The spelling of 28018563 in words is "twenty-eight million, eighteen thousand, five hundred sixty-three".