28022911 has 4 divisors (see below), whose sum is σ = 32026192. Its totient is φ = 24019632.

The previous prime is 28022893. The next prime is 28022921. The reversal of 28022911 is 11922082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28022911 - 2⁵ = 28022879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28022921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2001630 + ... + 2001643.

It is an arithmetic number, because the mean of its divisors is an integer number (8006548).

Almost surely, 2^28022911 is an apocalyptic number.

28022911 is a deficient number, since it is larger than the sum of its proper divisors (4003281).

28022911 is an equidigital number, since it uses as much as digits as its factorization.

28022911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4003280.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 28022911 is about 5293.6670654661. The cubic root of 28022911 is about 303.7416975721.

Adding to 28022911 its reverse (11922082), we get a palindrome (39944993).

The spelling of 28022911 in words is "twenty-eight million, twenty-two thousand, nine hundred eleven".