28861227 has 12 divisors (see below), whose sum is σ = 41735304. Its totient is φ = 19219200.

The previous prime is 28861219. The next prime is 28861237. The reversal of 28861227 is 72216882.

It is a happy number.

It is not a de Polignac number, because 28861227 - 2³ = 28861219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28861191 and 28861200.

It is not an unprimeable number, because it can be changed into a prime (28861237) 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 11 ways as a sum of consecutive naturals, for example, 13408 + ... + 15410.

It is an arithmetic number, because the mean of its divisors is an integer number (3477942).

Almost surely, 2^28861227 is an apocalyptic number.

28861227 is a deficient number, since it is larger than the sum of its proper divisors (12874077).

28861227 is a wasteful number, since it uses less digits than its factorization.

28861227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610 (or 3607 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 28861227 is about 5372.2646062903. The cubic root of 28861227 is about 306.7408360037.

The spelling of 28861227 in words is "twenty-eight million, eight hundred sixty-one thousand, two hundred twenty-seven".