28173227 has 2 divisors, whose sum is σ = 28173228. Its totient is φ = 28173226.

The previous prime is 28173209. The next prime is 28173241. The reversal of 28173227 is 72237182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28173227 - 2¹² = 28169131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28173193 and 28173202.

It is not a weakly prime, because it can be changed into another prime (28173247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14086613 + 14086614.

It is an arithmetic number, because the mean of its divisors is an integer number (14086614).

Almost surely, 2^28173227 is an apocalyptic number.

28173227 is a deficient number, since it is larger than the sum of its proper divisors (1).

28173227 is an equidigital number, since it uses as much as digits as its factorization.

28173227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 28173227 is about 5307.8457965544. The cubic root of 28173227 is about 304.2838235451.

The spelling of 28173227 in words is "twenty-eight million, one hundred seventy-three thousand, two hundred twenty-seven".