28189475 has 12 divisors (see below), whose sum is σ = 35060256. Its totient is φ = 22483680.

The previous prime is 28189463. The next prime is 28189477. The reversal of 28189475 is 57498182.

It is not a de Polignac number, because 28189475 - 2⁸ = 28189219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28189477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7814 + ... + 10836.

It is an arithmetic number, because the mean of its divisors is an integer number (2921688).

Almost surely, 2^28189475 is an apocalyptic number.

28189475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28189475 is a deficient number, since it is larger than the sum of its proper divisors (6870781).

28189475 is a wasteful number, since it uses less digits than its factorization.

28189475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3406 (or 3401 counting only the distinct ones).

The product of its digits is 161280, while the sum is 44.

The square root of 28189475 is about 5309.3761403766. The cubic root of 28189475 is about 304.3423075974.

The spelling of 28189475 in words is "twenty-eight million, one hundred eighty-nine thousand, four hundred seventy-five".