28238587 has 16 divisors (see below), whose sum is σ = 31409280. Its totient is φ = 25224192.

The previous prime is 28238569. The next prime is 28238591. The reversal of 28238587 is 78583282.

It is a cyclic number.

It is not a de Polignac number, because 28238587 - 2¹¹ = 28236539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28238527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68839 + ... + 69247.

It is an arithmetic number, because the mean of its divisors is an integer number (1963080).

Almost surely, 2^28238587 is an apocalyptic number.

28238587 is a deficient number, since it is larger than the sum of its proper divisors (3170693).

28238587 is a wasteful number, since it uses less digits than its factorization.

28238587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582.

The product of its digits is 215040, while the sum is 43.

The square root of 28238587 is about 5313.9991531802. Note that the first 3 decimals coincide. The cubic root of 28238587 is about 304.5189478459.

The spelling of 28238587 in words is "twenty-eight million, two hundred thirty-eight thousand, five hundred eighty-seven".