87855587 has 8 divisors (see below), whose sum is σ = 91063440. Its totient is φ = 84659680.

The previous prime is 87855577. The next prime is 87855619. The reversal of 87855587 is 78555878.

It is a happy number.

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 87855587 - 2²² = 83661283 is a prime.

It is a super-2 number, since 2×87855587² = 15437208334229138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87855517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13637 + ... + 19017.

It is an arithmetic number, because the mean of its divisors is an integer number (11382930).

Almost surely, 2^87855587 is an apocalyptic number.

87855587 is a deficient number, since it is larger than the sum of its proper divisors (3207853).

87855587 is a wasteful number, since it uses less digits than its factorization.

87855587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5973.

The product of its digits is 3136000, while the sum is 53.

The square root of 87855587 is about 9373.1311203887. The cubic root of 87855587 is about 444.5525730501.

It can be divided in two parts, 878 and 55587, that added together give a palindrome (56465).

The spelling of 87855587 in words is "eighty-seven million, eight hundred fifty-five thousand, five hundred eighty-seven".