28222115 has 8 divisors (see below), whose sum is σ = 33907248. Its totient is φ = 22550560.

The previous prime is 28222111. The next prime is 28222123. The reversal of 28222115 is 51122282.

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

It is not a de Polignac number, because 28222115 - 2² = 28222111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28222111) 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, 1949 + ... + 7761.

It is an arithmetic number, because the mean of its divisors is an integer number (4238406).

Almost surely, 2^28222115 is an apocalyptic number.

28222115 is a deficient number, since it is larger than the sum of its proper divisors (5685133).

28222115 is an equidigital number, since it uses as much as digits as its factorization.

28222115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6789.

The product of its digits is 640, while the sum is 23.

The square root of 28222115 is about 5312.4490585793. The cubic root of 28222115 is about 304.4597261417.

Adding to 28222115 its reverse (51122282), we get a palindrome (79344397).

The spelling of 28222115 in words is "twenty-eight million, two hundred twenty-two thousand, one hundred fifteen".