28505087 has 8 divisors (see below), whose sum is σ = 31412304. Its totient is φ = 25699968.

The previous prime is 28505053. The next prime is 28505093. The reversal of 28505087 is 78050582.

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 28505087 - 2¹² = 28500991 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 (28505387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24938 + ... + 26055.

It is an arithmetic number, because the mean of its divisors is an integer number (3926538).

Almost surely, 2^28505087 is an apocalyptic number.

28505087 is a deficient number, since it is larger than the sum of its proper divisors (2907217).

28505087 is a wasteful number, since it uses less digits than its factorization.

28505087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51049.

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 28505087 is about 5339.0155459598. The cubic root of 28505087 is about 305.4739098565.

The spelling of 28505087 in words is "twenty-eight million, five hundred five thousand, eighty-seven".