87217615660 has 72 divisors (see below), whose sum is σ = 225593169984. Its totient is φ = 28144166400.

The previous prime is 87217615631. The next prime is 87217615687. The reversal of 87217615660 is 6651671278.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2600916 + ... + 2634235.

It is an arithmetic number, because the mean of its divisors is an integer number (3133238472).

Almost surely, 2^87217615660 is an apocalyptic number.

It is an amenable number.

87217615660 is an abundant number, since it is smaller than the sum of its proper divisors (138375554324).

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

87217615660 is a wasteful number, since it uses less digits than its factorization.

87217615660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5235191 (or 5235182 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 87217615660 in words is "eighty-seven billion, two hundred seventeen million, six hundred fifteen thousand, six hundred sixty".