28004413 has 4 divisors (see below), whose sum is σ = 28042848. Its totient is φ = 27965980.

The previous prime is 28004393. The next prime is 28004419. The reversal of 28004413 is 31440082.

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 a cyclic number.

It is not a de Polignac number, because 28004413 - 2¹⁷ = 27873341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28004419) 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, 18103 + ... + 19588.

It is an arithmetic number, because the mean of its divisors is an integer number (7010712).

Almost surely, 2^28004413 is an apocalyptic number.

It is an amenable number.

28004413 is a deficient number, since it is larger than the sum of its proper divisors (38435).

28004413 is an equidigital number, since it uses as much as digits as its factorization.

28004413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38434.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 28004413 is about 5291.9195950052. The cubic root of 28004413 is about 303.6748492866.

Adding to 28004413 its reverse (31440082), we get a palindrome (59444495).

The spelling of 28004413 in words is "twenty-eight million, four thousand, four hundred thirteen".