28844399 has 4 divisors (see below), whose sum is σ = 29317320. Its totient is φ = 28371480.

The previous prime is 28844383. The next prime is 28844411. The reversal of 28844399 is 99344882.

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

It is a cyclic number.

It is not a de Polignac number, because 28844399 - 2⁴ = 28844383 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 (28844329) 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, 236369 + ... + 236490.

It is an arithmetic number, because the mean of its divisors is an integer number (7329330).

Almost surely, 2^28844399 is an apocalyptic number.

28844399 is a deficient number, since it is larger than the sum of its proper divisors (472921).

28844399 is an equidigital number, since it uses as much as digits as its factorization.

28844399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472920.

The product of its digits is 497664, while the sum is 47.

The square root of 28844399 is about 5370.6981855249. The cubic root of 28844399 is about 306.6812076963.

The spelling of 28844399 in words is "twenty-eight million, eight hundred forty-four thousand, three hundred ninety-nine".