28817227 has 4 divisors (see below), whose sum is σ = 30512376. Its totient is φ = 27122080.

The previous prime is 28817209. The next prime is 28817231. The reversal of 28817227 is 72271882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72271882 = 2 ⋅36135941.

It is a cyclic number.

It is not a de Polignac number, because 28817227 - 2⁷ = 28817099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28817287) 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 3 ways as a sum of consecutive naturals, for example, 847549 + ... + 847582.

It is an arithmetic number, because the mean of its divisors is an integer number (7628094).

Almost surely, 2^28817227 is an apocalyptic number.

28817227 is a deficient number, since it is larger than the sum of its proper divisors (1695149).

28817227 is a wasteful number, since it uses less digits than its factorization.

28817227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695148.

The product of its digits is 25088, while the sum is 37.

The square root of 28817227 is about 5368.1679370154. The cubic root of 28817227 is about 306.5848775006.

The spelling of 28817227 in words is "twenty-eight million, eight hundred seventeen thousand, two hundred twenty-seven".