28189088 has 12 divisors (see below), whose sum is σ = 55497330. Its totient is φ = 14094528.

The previous prime is 28189069. The next prime is 28189151. The reversal of 28189088 is 88098182.

It can be written as a sum of positive squares in only one way, i.e., 27164944 + 1024144 = 5212^2 + 1012^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 440423 + ... + 440486.

Almost surely, 2^28189088 is an apocalyptic number.

It is an amenable number.

28189088 is a deficient number, since it is larger than the sum of its proper divisors (27308242).

28189088 is an equidigital number, since it uses as much as digits as its factorization.

28189088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880919 (or 880911 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 44.

The square root of 28189088 is about 5309.3396952917. The cubic root of 28189088 is about 304.3409148670.

The spelling of 28189088 in words is "twenty-eight million, one hundred eighty-nine thousand, eighty-eight".