28500187 has 4 divisors (see below), whose sum is σ = 28645056. Its totient is φ = 28355320.

The previous prime is 28500163. The next prime is 28500239. The reversal of 28500187 is 78100582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28500187 - 2¹¹ = 28498139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28500107) 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, 72139 + ... + 72532.

It is an arithmetic number, because the mean of its divisors is an integer number (7161264).

Almost surely, 2^28500187 is an apocalyptic number.

28500187 is a deficient number, since it is larger than the sum of its proper divisors (144869).

28500187 is a wasteful number, since it uses less digits than its factorization.

28500187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144868.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 28500187 is about 5338.5566401416. The cubic root of 28500187 is about 305.4564052858.

The spelling of 28500187 in words is "twenty-eight million, five hundred thousand, one hundred eighty-seven".