28855219 has 2 divisors, whose sum is σ = 28855220. Its totient is φ = 28855218.

The previous prime is 28855217. The next prime is 28855223. The reversal of 28855219 is 91255882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28855219 - 2¹ = 28855217 is a prime.

It is a super-2 number, since 2×28855219² = 1665247327075922, which contains 22 as substring.

Together with 28855217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28855213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14427609 + 14427610.

It is an arithmetic number, because the mean of its divisors is an integer number (14427610).

Almost surely, 2^28855219 is an apocalyptic number.

28855219 is a deficient number, since it is larger than the sum of its proper divisors (1).

28855219 is an equidigital number, since it uses as much as digits as its factorization.

28855219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 40.

The square root of 28855219 is about 5371.7054088995. The cubic root of 28855219 is about 306.7195499275.

The spelling of 28855219 in words is "twenty-eight million, eight hundred fifty-five thousand, two hundred nineteen".