87565855 has 16 divisors (see below), whose sum is σ = 116815104. Its totient is φ = 62576640.

The previous prime is 87565817. The next prime is 87565859. The reversal of 87565855 is 55856578.

It is a happy number.

It is not a de Polignac number, because 87565855 - 2⁹ = 87565343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87565799 and 87565808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87565859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19714 + ... + 23743.

It is an arithmetic number, because the mean of its divisors is an integer number (7300944).

Almost surely, 2^87565855 is an apocalyptic number.

87565855 is a deficient number, since it is larger than the sum of its proper divisors (29249249).

87565855 is a wasteful number, since it uses less digits than its factorization.

87565855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43506.

The product of its digits is 1680000, while the sum is 49.

The square root of 87565855 is about 9357.6629026697. The cubic root of 87565855 is about 444.0633499279.

The spelling of 87565855 in words is "eighty-seven million, five hundred sixty-five thousand, eight hundred fifty-five".