28810849 has 4 divisors (see below), whose sum is σ = 29283220. Its totient is φ = 28338480.

The previous prime is 28810841. The next prime is 28810867. The reversal of 28810849 is 94801882.

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 10595025 + 18215824 = 3255^2 + 4268^2 .

It is a cyclic number.

It is not a de Polignac number, because 28810849 - 2³ = 28810841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28810841) 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, 236094 + ... + 236215.

It is an arithmetic number, because the mean of its divisors is an integer number (7320805).

Almost surely, 2^28810849 is an apocalyptic number.

It is an amenable number.

28810849 is a deficient number, since it is larger than the sum of its proper divisors (472371).

28810849 is an equidigital number, since it uses as much as digits as its factorization.

28810849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472370.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 28810849 is about 5367.5738467207. The cubic root of 28810849 is about 306.5622574358.

The spelling of 28810849 in words is "twenty-eight million, eight hundred ten thousand, eight hundred forty-nine".