28166227 has 8 divisors (see below), whose sum is σ = 29806160. Its totient is φ = 26542080.

The previous prime is 28166209. The next prime is 28166233. The reversal of 28166227 is 72266182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28166227 - 2¹⁵ = 28133459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28166192 and 28166201.

It is not an unprimeable number, because it can be changed into a prime (28166027) 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, 174 + ... + 7507.

It is an arithmetic number, because the mean of its divisors is an integer number (3725770).

Almost surely, 2^28166227 is an apocalyptic number.

28166227 is a deficient number, since it is larger than the sum of its proper divisors (1639933).

28166227 is a wasteful number, since it uses less digits than its factorization.

28166227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7893.

The product of its digits is 16128, while the sum is 34.

The square root of 28166227 is about 5307.1863543690. The cubic root of 28166227 is about 304.2586203833.

The spelling of 28166227 in words is "twenty-eight million, one hundred sixty-six thousand, two hundred twenty-seven".