28105222 has 4 divisors (see below), whose sum is σ = 42157836. Its totient is φ = 14052610.

The previous prime is 28105183. The next prime is 28105229. The reversal of 28105222 is 22250182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22250182 = 2 ⋅11125091.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 28105193 and 28105202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28105229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7026304 + ... + 7026307.

It is an arithmetic number, because the mean of its divisors is an integer number (10539459).

Almost surely, 2^28105222 is an apocalyptic number.

28105222 is a deficient number, since it is larger than the sum of its proper divisors (14052614).

28105222 is a wasteful number, since it uses less digits than its factorization.

28105222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14052613.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 28105222 is about 5301.4358432410. The cubic root of 28105222 is about 304.0387978529.

The spelling of 28105222 in words is "twenty-eight million, one hundred five thousand, two hundred twenty-two".