28189300 has 18 divisors (see below), whose sum is σ = 61170998. Its totient is φ = 11275680.

The previous prime is 28189279. The next prime is 28189307. The reversal of 28189300 is 398182.

It can be written as a sum of positive squares in 3 ways, for example, as 5550736 + 22638564 = 2356^2 + 4758^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28189307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140847 + ... + 141046.

Almost surely, 2^28189300 is an apocalyptic number.

28189300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28189300 is an abundant number, since it is smaller than the sum of its proper divisors (32981698).

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

28189300 is a wasteful number, since it uses less digits than its factorization.

28189300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281907 (or 281900 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 28189300 is about 5309.3596600720. The cubic root of 28189300 is about 304.3416778113.

The spelling of 28189300 in words is "twenty-eight million, one hundred eighty-nine thousand, three hundred".