87765138180 has 36 divisors (see below), whose sum is σ = 266220919692. Its totient is φ = 23404036800.

The previous prime is 87765138163. The next prime is 87765138193. The reversal of 87765138180 is 8183156778.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25237135044 + 62528003136 = 158862^2 + 250056^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243791871 + ... + 243792230.

It is an arithmetic number, because the mean of its divisors is an integer number (7395025547).

Almost surely, 2^87765138180 is an apocalyptic number.

It is an amenable number.

87765138180 is an abundant number, since it is smaller than the sum of its proper divisors (178455781512).

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

87765138180 is a wasteful number, since it uses less digits than its factorization.

87765138180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487584116 (or 487584111 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 54.

The spelling of 87765138180 in words is "eighty-seven billion, seven hundred sixty-five million, one hundred thirty-eight thousand, one hundred eighty".