28189573 has 4 divisors (see below), whose sum is σ = 28213740. Its totient is φ = 28165408.

The previous prime is 28189543. The next prime is 28189583. The reversal of 28189573 is 37598182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37598182 = 2 ⋅18799091.

It can be written as a sum of positive squares in 2 ways, for example, as 19651489 + 8538084 = 4433^2 + 2922^2 .

It is a cyclic number.

It is not a de Polignac number, because 28189573 - 2¹⁷ = 28058501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28189543) 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, 10240 + ... + 12697.

It is an arithmetic number, because the mean of its divisors is an integer number (7053435).

Almost surely, 2^28189573 is an apocalyptic number.

It is an amenable number.

28189573 is a deficient number, since it is larger than the sum of its proper divisors (24167).

28189573 is a wasteful number, since it uses less digits than its factorization.

28189573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24166.

The product of its digits is 120960, while the sum is 43.

The square root of 28189573 is about 5309.3853693248. The cubic root of 28189573 is about 304.3426602764.

The spelling of 28189573 in words is "twenty-eight million, one hundred eighty-nine thousand, five hundred seventy-three".