28228166566 has 16 divisors (see below), whose sum is σ = 43903995840. Its totient is φ = 13595760640.

The previous prime is 28228166557. The next prime is 28228166597. The reversal of 28228166566 is 66566182282.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 539611 + ... + 589606.

It is an arithmetic number, because the mean of its divisors is an integer number (2743999740).

Almost surely, 2^28228166566 is an apocalyptic number.

28228166566 is a deficient number, since it is larger than the sum of its proper divisors (15675829274).

28228166566 is a wasteful number, since it uses less digits than its factorization.

28228166566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129679.

The product of its digits is 3317760, while the sum is 52.

The spelling of 28228166566 in words is "twenty-eight billion, two hundred twenty-eight million, one hundred sixty-six thousand, five hundred sixty-six".