28561386187 has 8 divisors (see below), whose sum is σ = 29157479280. Its totient is φ = 27967411680.

The previous prime is 28561386181. The next prime is 28561386193. The reversal of 28561386187 is 78168316582.

It is an interprime number because it is at equal distance from previous prime (28561386181) and next prime (28561386193).

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 28561386187 - 2¹¹ = 28561384139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28561386181) 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 7 ways as a sum of consecutive naturals, for example, 502389 + ... + 556342.

It is an arithmetic number, because the mean of its divisors is an integer number (3644684910).

Almost surely, 2^28561386187 is an apocalyptic number.

28561386187 is a deficient number, since it is larger than the sum of its proper divisors (596093093).

28561386187 is a wasteful number, since it uses less digits than its factorization.

28561386187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059293.

The product of its digits is 3870720, while the sum is 55.

The spelling of 28561386187 in words is "twenty-eight billion, five hundred sixty-one million, three hundred eighty-six thousand, one hundred eighty-seven".