28561087 has 4 divisors (see below), whose sum is σ = 28646176. Its totient is φ = 28476000.

The previous prime is 28561069. The next prime is 28561111. The reversal of 28561087 is 78016582.

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 28561087 - 2¹¹ = 28559039 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 (28561067) 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, 42039 + ... + 42712.

It is an arithmetic number, because the mean of its divisors is an integer number (7161544).

Almost surely, 2^28561087 is an apocalyptic number.

28561087 is a deficient number, since it is larger than the sum of its proper divisors (85089).

28561087 is an equidigital number, since it uses as much as digits as its factorization.

28561087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85088.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 28561087 is about 5344.2573852688. The cubic root of 28561087 is about 305.6738197753.

The spelling of 28561087 in words is "twenty-eight million, five hundred sixty-one thousand, eighty-seven".