28119217 has 4 divisors (see below), whose sum is σ = 32136256. Its totient is φ = 24102180.

The previous prime is 28119199. The next prime is 28119227. The reversal of 28119217 is 71291182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28119217 - 2²³ = 19730609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28119227) 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, 2008509 + ... + 2008522.

It is an arithmetic number, because the mean of its divisors is an integer number (8034064).

Almost surely, 2^28119217 is an apocalyptic number.

It is an amenable number.

28119217 is a deficient number, since it is larger than the sum of its proper divisors (4017039).

28119217 is an equidigital number, since it uses as much as digits as its factorization.

28119217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4017038.

The product of its digits is 2016, while the sum is 31.

The square root of 28119217 is about 5302.7556044004. The cubic root of 28119217 is about 304.0892548689.

The spelling of 28119217 in words is "twenty-eight million, one hundred nineteen thousand, two hundred seventeen".