28369219 has 4 divisors (see below), whose sum is σ = 28381096. Its totient is φ = 28357344.

The previous prime is 28369213. The next prime is 28369249. The reversal of 28369219 is 91296382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28369219 - 2⁷ = 28369091 is a prime.

It is a super-2 number, since 2×28369219² = 1609625173339922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28369213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969 + ... + 7594.

It is an arithmetic number, because the mean of its divisors is an integer number (7095274).

Almost surely, 2^28369219 is an apocalyptic number.

28369219 is a deficient number, since it is larger than the sum of its proper divisors (11877).

28369219 is an equidigital number, since it uses as much as digits as its factorization.

28369219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11876.

The product of its digits is 46656, while the sum is 40.

The square root of 28369219 is about 5326.2762789776. The cubic root of 28369219 is about 304.9877949071.

The spelling of 28369219 in words is "twenty-eight million, three hundred sixty-nine thousand, two hundred nineteen".