28220227 has 6 divisors (see below), whose sum is σ = 32827668. Its totient is φ = 24188724.

The previous prime is 28220191. The next prime is 28220273. The reversal of 28220227 is 72202282.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-28220227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28221227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 287913 + ... + 288010.

It is an arithmetic number, because the mean of its divisors is an integer number (5471278).

Almost surely, 2^28220227 is an apocalyptic number.

28220227 is a deficient number, since it is larger than the sum of its proper divisors (4607441).

28220227 is an equidigital number, since it uses as much as digits as its factorization.

28220227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575937 (or 575930 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 28220227 is about 5312.2713597858. The cubic root of 28220227 is about 304.4529367524.

The spelling of 28220227 in words is "twenty-eight million, two hundred twenty thousand, two hundred twenty-seven".