28228222 has 16 divisors (see below), whose sum is σ = 48200832. Its totient is φ = 12272920.

The previous prime is 28228169. The next prime is 28228229. The reversal of 28228222 is 22282282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28228229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27388 + ... + 28399.

It is an arithmetic number, because the mean of its divisors is an integer number (3012552).

Almost surely, 2^28228222 is an apocalyptic number.

28228222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28228222 is a deficient number, since it is larger than the sum of its proper divisors (19972610).

28228222 is a wasteful number, since it uses less digits than its factorization.

28228222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55823.

The product of its digits is 4096, while the sum is 28.

The square root of 28228222 is about 5313.0238094705. The cubic root of 28228222 is about 304.4816852974.

The spelling of 28228222 in words is "twenty-eight million, two hundred twenty-eight thousand, two hundred twenty-two".