28189828 has 6 divisors (see below), whose sum is σ = 49332206. Its totient is φ = 14094912.

The previous prime is 28189813. The next prime is 28189829. The reversal of 28189828 is 82898182.

It can be written as a sum of positive squares in only one way, i.e., 19998784 + 8191044 = 4472^2 + 2862^2 .

It is not an unprimeable number, because it can be changed into a prime (28189829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3523725 + ... + 3523732.

Almost surely, 2^28189828 is an apocalyptic number.

It is an amenable number.

28189828 is a deficient number, since it is larger than the sum of its proper divisors (21142378).

28189828 is a wasteful number, since it uses less digits than its factorization.

28189828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7047461 (or 7047459 counting only the distinct ones).

The product of its digits is 147456, while the sum is 46.

The square root of 28189828 is about 5309.4093833495. The cubic root of 28189828 is about 304.3435779579.

It can be divided in two parts, 281 and 89828, that added together give a palindrome (90109).

The spelling of 28189828 in words is "twenty-eight million, one hundred eighty-nine thousand, eight hundred twenty-eight".