87178895181 has 48 divisors (see below), whose sum is σ = 153663983616. Its totient is φ = 46542390048.

The previous prime is 87178895179. The next prime is 87178895189. The reversal of 87178895181 is 18159887178.

It is not a de Polignac number, because 87178895181 - 2¹ = 87178895179 is a prime.

It is a super-2 number, since 2×87178895181² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87178895189) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 637285 + ... + 761898.

It is an arithmetic number, because the mean of its divisors is an integer number (3201332992).

Almost surely, 2^87178895181 is an apocalyptic number.

It is an amenable number.

87178895181 is a deficient number, since it is larger than the sum of its proper divisors (66485088435).

87178895181 is a wasteful number, since it uses less digits than its factorization.

87178895181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399262 (or 1399259 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 63.

The spelling of 87178895181 in words is "eighty-seven billion, one hundred seventy-eight million, eight hundred ninety-five thousand, one hundred eighty-one".