28445289 has 4 divisors (see below), whose sum is σ = 37927056. Its totient is φ = 18963524.

The previous prime is 28445281. The next prime is 28445297. The reversal of 28445289 is 98254482.

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 an interprime number because it is at equal distance from previous prime (28445281) and next prime (28445297).

It is a cyclic number.

It is not a de Polignac number, because 28445289 - 2³ = 28445281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28445289.

It is not an unprimeable number, because it can be changed into a prime (28445281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4740879 + ... + 4740884.

It is an arithmetic number, because the mean of its divisors is an integer number (9481764).

Almost surely, 2^28445289 is an apocalyptic number.

It is an amenable number.

28445289 is a deficient number, since it is larger than the sum of its proper divisors (9481767).

28445289 is an equidigital number, since it uses as much as digits as its factorization.

28445289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9481766.

The product of its digits is 184320, while the sum is 42.

The square root of 28445289 is about 5333.4125098290. The cubic root of 28445289 is about 305.2601524888.

The spelling of 28445289 in words is "twenty-eight million, four hundred forty-five thousand, two hundred eighty-nine".