28222566 has 16 divisors (see below), whose sum is σ = 56519424. Its totient is φ = 9395144.

The previous prime is 28222561. The next prime is 28222609. The reversal of 28222566 is 66522282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28222561) 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, 2671 + ... + 7973.

It is an arithmetic number, because the mean of its divisors is an integer number (3532464).

Almost surely, 2^28222566 is an apocalyptic number.

28222566 is an abundant number, since it is smaller than the sum of its proper divisors (28296858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28222566 is a wasteful number, since it uses less digits than its factorization.

28222566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6195.

The product of its digits is 23040, while the sum is 33.

The square root of 28222566 is about 5312.4915058756. The cubic root of 28222566 is about 304.4613479267.

The spelling of 28222566 in words is "twenty-eight million, two hundred twenty-two thousand, five hundred sixty-six".