28444289 has 2 divisors, whose sum is σ = 28444290. Its totient is φ = 28444288.

The previous prime is 28444279. The next prime is 28444301. The reversal of 28444289 is 98244482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19492225 + 8952064 = 4415^2 + 2992^2 .

It is a cyclic number.

It is not a de Polignac number, because 28444289 - 2⁸ = 28444033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28444219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14222144 + 14222145.

It is an arithmetic number, because the mean of its divisors is an integer number (14222145).

Almost surely, 2^28444289 is an apocalyptic number.

It is an amenable number.

28444289 is a deficient number, since it is larger than the sum of its proper divisors (1).

28444289 is an equidigital number, since it uses as much as digits as its factorization.

28444289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 147456, while the sum is 41.

The square root of 28444289 is about 5333.3187603968. The cubic root of 28444289 is about 305.2565752857.

The spelling of 28444289 in words is "twenty-eight million, four hundred forty-four thousand, two hundred eighty-nine".