28104857 has 16 divisors (see below), whose sum is σ = 33393600. Its totient is φ = 23365440.

The previous prime is 28104841. The next prime is 28104863. The reversal of 28104857 is 75840182.

It is not a de Polignac number, because 28104857 - 2⁴ = 28104841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28100857) 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 15 ways as a sum of consecutive naturals, for example, 3743 + ... + 8379.

It is an arithmetic number, because the mean of its divisors is an integer number (2087100).

Almost surely, 2^28104857 is an apocalyptic number.

It is an amenable number.

28104857 is a deficient number, since it is larger than the sum of its proper divisors (5288743).

28104857 is a wasteful number, since it uses less digits than its factorization.

28104857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4696.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 28104857 is about 5301.4014184930. The cubic root of 28104857 is about 304.0374816724.

It can be divided in two parts, 2810 and 4857, that added together give a palindrome (7667).

The spelling of 28104857 in words is "twenty-eight million, one hundred four thousand, eight hundred fifty-seven".