28204219 has 2 divisors, whose sum is σ = 28204220. Its totient is φ = 28204218.

The previous prime is 28204217. The next prime is 28204223. The reversal of 28204219 is 91240282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28204219 - 2¹ = 28204217 is a prime.

It is a super-2 number, since 2×28204219² = 1590955938799922, which contains 22 as substring.

Together with 28204217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28204217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14102109 + 14102110.

It is an arithmetic number, because the mean of its divisors is an integer number (14102110).

Almost surely, 2^28204219 is an apocalyptic number.

28204219 is a deficient number, since it is larger than the sum of its proper divisors (1).

28204219 is an equidigital number, since it uses as much as digits as its factorization.

28204219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 28204219 is about 5310.7644459155. The cubic root of 28204219 is about 304.3953586136.

The spelling of 28204219 in words is "twenty-eight million, two hundred four thousand, two hundred nineteen".