87815508 has 72 divisors (see below), whose sum is σ = 227104416. Its totient is φ = 26389440.

The previous prime is 87815501. The next prime is 87815513. The reversal of 87815508 is 80551878.

It is a self number, because there is not a number n which added to its sum of digits gives 87815508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87815501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285891 + ... + 286197.

It is an arithmetic number, because the mean of its divisors is an integer number (3154228).

Almost surely, 2^87815508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87815508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113552208).

87815508 is an abundant number, since it is smaller than the sum of its proper divisors (139288908).

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

87815508 is a wasteful number, since it uses less digits than its factorization.

87815508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 42.

The square root of 87815508 is about 9370.9929036362. The cubic root of 87815508 is about 444.4849623524.

The spelling of 87815508 in words is "eighty-seven million, eight hundred fifteen thousand, five hundred eight".