28136587 has 8 divisors (see below), whose sum is σ = 30177360. Its totient is φ = 26151840.

The previous prime is 28136557. The next prime is 28136599. The reversal of 28136587 is 78563182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28136587 - 2¹¹ = 28134539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28136557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12964 + ... + 14977.

It is an arithmetic number, because the mean of its divisors is an integer number (3772170).

Almost surely, 2^28136587 is an apocalyptic number.

28136587 is a deficient number, since it is larger than the sum of its proper divisors (2040773).

28136587 is a wasteful number, since it uses less digits than its factorization.

28136587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28013.

The product of its digits is 80640, while the sum is 40.

The square root of 28136587 is about 5304.3931792430. The cubic root of 28136587 is about 304.1518566964.

The spelling of 28136587 in words is "twenty-eight million, one hundred thirty-six thousand, five hundred eighty-seven".