28117227 has 16 divisors (see below), whose sum is σ = 38580608. Its totient is φ = 18204480.

The previous prime is 28117213. The next prime is 28117231. The reversal of 28117227 is 72271182.

It is a happy number.

It is not a de Polignac number, because 28117227 - 2¹⁶ = 28051691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28117194 and 28117203.

It is not an unprimeable number, because it can be changed into a prime (28117237) 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 15 ways as a sum of consecutive naturals, for example, 26703 + ... + 27735.

It is an arithmetic number, because the mean of its divisors is an integer number (2411288).

Almost surely, 2^28117227 is an apocalyptic number.

28117227 is a deficient number, since it is larger than the sum of its proper divisors (10463381).

28117227 is a wasteful number, since it uses less digits than its factorization.

28117227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290.

The product of its digits is 3136, while the sum is 30.

The square root of 28117227 is about 5302.5679627894. The cubic root of 28117227 is about 304.0820812233.

The spelling of 28117227 in words is "twenty-eight million, one hundred seventeen thousand, two hundred twenty-seven".