28109587 has 8 divisors (see below), whose sum is σ = 30900672. Its totient is φ = 25357800.

The previous prime is 28109579. The next prime is 28109597. The reversal of 28109587 is 78590182.

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 28109587 - 2³ = 28109579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28109537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8313 + ... + 11194.

It is an arithmetic number, because the mean of its divisors is an integer number (3862584).

Almost surely, 2^28109587 is an apocalyptic number.

28109587 is a deficient number, since it is larger than the sum of its proper divisors (2791085).

28109587 is a wasteful number, since it uses less digits than its factorization.

28109587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19649.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28109587 is about 5301.8475081805. The cubic root of 28109587 is about 304.0545370473.

It can be divided in two parts, 281095 and 87, that added together give a palindrome (281182).

The spelling of 28109587 in words is "twenty-eight million, one hundred nine thousand, five hundred eighty-seven".