28568819 has 4 divisors (see below), whose sum is σ = 28750944. Its totient is φ = 28386696.

The previous prime is 28568807. The next prime is 28568821. The reversal of 28568819 is 91886582.

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 28568819 - 2⁸ = 28568563 is a prime.

It is a super-2 number, since 2×28568819² = 1632354838109522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28568879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90827 + ... + 91140.

It is an arithmetic number, because the mean of its divisors is an integer number (7187736).

Almost surely, 2^28568819 is an apocalyptic number.

28568819 is a deficient number, since it is larger than the sum of its proper divisors (182125).

28568819 is a wasteful number, since it uses less digits than its factorization.

28568819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182124.

The product of its digits is 276480, while the sum is 47.

The square root of 28568819 is about 5344.9807296191. The cubic root of 28568819 is about 305.7014010870.

The spelling of 28568819 in words is "twenty-eight million, five hundred sixty-eight thousand, eight hundred nineteen".