28249228 has 12 divisors (see below), whose sum is σ = 56498512. Its totient is φ = 12106800.

The previous prime is 28249187. The next prime is 28249229. The reversal of 28249228 is 82294282.

28249228 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28249229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504423 + ... + 504478.

Almost surely, 2^28249228 is an apocalyptic number.

28249228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28249228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28249228 is a wasteful number, since it uses less digits than its factorization.

28249228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008912 (or 1008910 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 28249228 is about 5315.0002822201. Note that the first 3 decimals coincide. The cubic root of 28249228 is about 304.5571931400.

The spelling of 28249228 in words is "twenty-eight million, two hundred forty-nine thousand, two hundred twenty-eight".