28320219 has 8 divisors (see below), whose sum is σ = 41955920. Its totient is φ = 18880128.

The previous prime is 28320197. The next prime is 28320221. The reversal of 28320219 is 91202382.

It is a happy number.

It is not a de Polignac number, because 28320219 - 2⁷ = 28320091 is a prime.

It is a super-2 number, since 2×28320219² = 1604069608415922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1048897 = 28320219 / (2 + 8 + 3 + 2 + 0 + 2 + 1 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28320192 and 28320201.

It is not an unprimeable number, because it can be changed into a prime (28320239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524422 + ... + 524475.

It is an arithmetic number, because the mean of its divisors is an integer number (5244490).

Almost surely, 2^28320219 is an apocalyptic number.

28320219 is a deficient number, since it is larger than the sum of its proper divisors (13635701).

28320219 is a wasteful number, since it uses less digits than its factorization.

28320219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048906 (or 1048900 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28320219 is about 5321.6744545303. The cubic root of 28320219 is about 304.8120996189.

It can be divided in two parts, 283 and 20219, that added together give a palindrome (20502).

The spelling of 28320219 in words is "twenty-eight million, three hundred twenty thousand, two hundred nineteen".