28198219 has 8 divisors (see below), whose sum is σ = 32272128. Its totient is φ = 24135720.

The previous prime is 28198217. The next prime is 28198243. The reversal of 28198219 is 91289182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28198219 - 2¹ = 28198217 is a prime.

It is a super-2 number, since 2×28198219² = 1590279109543922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28198211) 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 in 7 ways as a sum of consecutive naturals, for example, 3354 + ... + 8224.

It is an arithmetic number, because the mean of its divisors is an integer number (4034016).

Almost surely, 2^28198219 is an apocalyptic number.

28198219 is a deficient number, since it is larger than the sum of its proper divisors (4073909).

28198219 is an equidigital number, since it uses as much as digits as its factorization.

28198219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5705.

The product of its digits is 20736, while the sum is 40.

The square root of 28198219 is about 5310.1995254416. The cubic root of 28198219 is about 304.3737719889.

The spelling of 28198219 in words is "twenty-eight million, one hundred ninety-eight thousand, two hundred nineteen".