28571228 has 12 divisors (see below), whose sum is σ = 57142512. Its totient is φ = 12244800.

The previous prime is 28571227. The next prime is 28571239. The reversal of 28571228 is 82217582.

28571228 is an admirable number.

It is a super-3 number, since 3×28571228³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28571227) 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, 510173 + ... + 510228.

It is an arithmetic number, because the mean of its divisors is an integer number (4761876).

Almost surely, 2^28571228 is an apocalyptic number.

28571228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28571228 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.

28571228 is a wasteful number, since it uses less digits than its factorization.

28571228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020412 (or 1020410 counting only the distinct ones).

The product of its digits is 17920, while the sum is 35.

The square root of 28571228 is about 5345.2060764764. The cubic root of 28571228 is about 305.7099933681.

The spelling of 28571228 in words is "twenty-eight million, five hundred seventy-one thousand, two hundred twenty-eight".