28256228 has 48 divisors (see below), whose sum is σ = 66401664. Its totient is φ = 10160640.

The previous prime is 28256201. The next prime is 28256231. The reversal of 28256228 is 82265282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 476 + ... + 7532.

It is an arithmetic number, because the mean of its divisors is an integer number (1383368).

Almost surely, 2^28256228 is an apocalyptic number.

28256228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28256228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33200832).

28256228 is an abundant number, since it is smaller than the sum of its proper divisors (38145436).

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

28256228 is a wasteful number, since it uses less digits than its factorization.

28256228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7092 (or 7090 counting only the distinct ones).

The product of its digits is 30720, while the sum is 35.

The square root of 28256228 is about 5315.6587550369. The cubic root of 28256228 is about 304.5823469163.

The spelling of 28256228 in words is "twenty-eight million, two hundred fifty-six thousand, two hundred twenty-eight".