28444219 has 2 divisors, whose sum is σ = 28444220. Its totient is φ = 28444218.

The previous prime is 28444217. The next prime is 28444223. The reversal of 28444219 is 91244482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28444219 - 2¹ = 28444217 is a prime.

It is a super-2 number, since 2×28444219² = 1618147189039922, which contains 22 as substring.

Together with 28444217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28444217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14222109 + 14222110.

It is an arithmetic number, because the mean of its divisors is an integer number (14222110).

Almost surely, 2^28444219 is an apocalyptic number.

28444219 is a deficient number, since it is larger than the sum of its proper divisors (1).

28444219 is an equidigital number, since it uses as much as digits as its factorization.

28444219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 34.

The square root of 28444219 is about 5333.3121978748. The cubic root of 28444219 is about 305.2563248783.

The spelling of 28444219 in words is "twenty-eight million, four hundred forty-four thousand, two hundred nineteen".