28987227 has 28 divisors (see below), whose sum is σ = 46037160. Its totient is φ = 18180288.

The previous prime is 28987207. The next prime is 28987253. The reversal of 28987227 is 72278982.

It is a happy number.

It is not a de Polignac number, because 28987227 - 2⁶ = 28987163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28987207) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 11224 + ... + 13562.

Almost surely, 2^28987227 is an apocalyptic number.

28987227 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28987227 is a deficient number, since it is larger than the sum of its proper divisors (17049933).

28987227 is an equidigital number, since it uses as much as digits as its factorization.

28987227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374 (or 2359 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 28987227 is about 5383.9787332418. The cubic root of 28987227 is about 307.1865693896.

The spelling of 28987227 in words is "twenty-eight million, nine hundred eighty-seven thousand, two hundred twenty-seven".