87866815 has 16 divisors (see below), whose sum is σ = 108510048. Its totient is φ = 68276736.

The previous prime is 87866797. The next prime is 87866837. The reversal of 87866815 is 51866878.

It is a cyclic number.

It is not a de Polignac number, because 87866815 - 2¹¹ = 87864767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 22659 + ... + 26251.

It is an arithmetic number, because the mean of its divisors is an integer number (6781878).

Almost surely, 2^87866815 is an apocalyptic number.

87866815 is a deficient number, since it is larger than the sum of its proper divisors (20643233).

87866815 is a wasteful number, since it uses less digits than its factorization.

87866815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3738.

The product of its digits is 645120, while the sum is 49.

The square root of 87866815 is about 9373.7300473184. The cubic root of 87866815 is about 444.5715102775.

The spelling of 87866815 in words is "eighty-seven million, eight hundred sixty-six thousand, eight hundred fifteen".