87655218 has 48 divisors (see below), whose sum is σ = 204718464. Its totient is φ = 24948000.

The previous prime is 87655193. The next prime is 87655237. The reversal of 87655218 is 81255678.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87655218.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116343 + ... + 117093.

It is an arithmetic number, because the mean of its divisors is an integer number (4264968).

Almost surely, 2^87655218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87655218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102359232).

87655218 is an abundant number, since it is smaller than the sum of its proper divisors (117063246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87655218 is a wasteful number, since it uses less digits than its factorization.

87655218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167 (or 1160 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 87655218 is about 9362.4365418410. The cubic root of 87655218 is about 444.2143575769.

The spelling of 87655218 in words is "eighty-seven million, six hundred fifty-five thousand, two hundred eighteen".