28223105 has 12 divisors (see below), whose sum is σ = 34233660. Its totient is φ = 22336704.

The previous prime is 28223099. The next prime is 28223123. The reversal of 28223105 is 50132282.

It can be written as a sum of positive squares in 6 ways, for example, as 16384 + 28206721 = 128^2 + 5311^2 .

It is not a de Polignac number, because 28223105 - 2⁴ = 28223089 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123131 + ... + 123359.

It is an arithmetic number, because the mean of its divisors is an integer number (2852805).

Almost surely, 2^28223105 is an apocalyptic number.

It is an amenable number.

28223105 is a deficient number, since it is larger than the sum of its proper divisors (6010555).

28223105 is an equidigital number, since it uses as much as digits as its factorization.

28223105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 28223105 is about 5312.5422351262. The cubic root of 28223105 is about 304.4632861349.

Adding to 28223105 its reverse (50132282), we get a palindrome (78355387).

The spelling of 28223105 in words is "twenty-eight million, two hundred twenty-three thousand, one hundred five".