28504859 has 4 divisors (see below), whose sum is σ = 28865760. Its totient is φ = 28143960.

The previous prime is 28504793. The next prime is 28504871. The reversal of 28504859 is 95840582.

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 28504859 - 2⁸ = 28504603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28504459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180332 + ... + 180489.

It is an arithmetic number, because the mean of its divisors is an integer number (7216440).

Almost surely, 2^28504859 is an apocalyptic number.

28504859 is a deficient number, since it is larger than the sum of its proper divisors (360901).

28504859 is an equidigital number, since it uses as much as digits as its factorization.

28504859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360900.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 28504859 is about 5338.9941936661. The cubic root of 28504859 is about 305.4730954026.

The spelling of 28504859 in words is "twenty-eight million, five hundred four thousand, eight hundred fifty-nine".