28556849 has 4 divisors (see below), whose sum is σ = 28620900. Its totient is φ = 28492800.

The previous prime is 28556831. The next prime is 28556873. The reversal of 28556849 is 94865582.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22090000 + 6466849 = 4700^2 + 2543^2 .

It is a cyclic number.

It is not a de Polignac number, because 28556849 - 2¹² = 28552753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28556809) 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, 31352 + ... + 32249.

It is an arithmetic number, because the mean of its divisors is an integer number (7155225).

Almost surely, 2^28556849 is an apocalyptic number.

It is an amenable number.

28556849 is a deficient number, since it is larger than the sum of its proper divisors (64051).

28556849 is an equidigital number, since it uses as much as digits as its factorization.

28556849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64050.

The product of its digits is 691200, while the sum is 47.

The square root of 28556849 is about 5343.8608701949. The cubic root of 28556849 is about 305.6587000225.

The spelling of 28556849 in words is "twenty-eight million, five hundred fifty-six thousand, eight hundred forty-nine".