28004817 has 4 divisors (see below), whose sum is σ = 37339760. Its totient is φ = 18669876.

The previous prime is 28004813. The next prime is 28004833. The reversal of 28004817 is 71840082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28004817 - 2² = 28004813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28004813) 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 3 ways as a sum of consecutive naturals, for example, 4667467 + ... + 4667472.

It is an arithmetic number, because the mean of its divisors is an integer number (9334940).

Almost surely, 2^28004817 is an apocalyptic number.

It is an amenable number.

28004817 is a deficient number, since it is larger than the sum of its proper divisors (9334943).

28004817 is an equidigital number, since it uses as much as digits as its factorization.

28004817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9334942.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28004817 is about 5291.9577662714. The cubic root of 28004817 is about 303.6763095808.

Adding to 28004817 its reverse (71840082), we get a palindrome (99844899).

The spelling of 28004817 in words is "twenty-eight million, four thousand, eight hundred seventeen".