28550219 has 2 divisors, whose sum is σ = 28550220. Its totient is φ = 28550218.

The previous prime is 28550201. The next prime is 28550231. The reversal of 28550219 is 91205582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28550219 - 2¹² = 28546123 is a prime.

It is a super-2 number, since 2×28550219² = 1630230009895922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28550299) 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 as a sum of consecutive naturals, namely, 14275109 + 14275110.

It is an arithmetic number, because the mean of its divisors is an integer number (14275110).

Almost surely, 2^28550219 is an apocalyptic number.

28550219 is a deficient number, since it is larger than the sum of its proper divisors (1).

28550219 is an equidigital number, since it uses as much as digits as its factorization.

28550219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 28550219 is about 5343.2404961783. The cubic root of 28550219 is about 305.6350434205.

The spelling of 28550219 in words is "twenty-eight million, five hundred fifty thousand, two hundred nineteen".