87178291218 has 24 divisors (see below), whose sum is σ = 191008619100. Its totient is φ = 28732919424.

The previous prime is 87178291199. The next prime is 87178291219. The reversal of 87178291218 is 81219287178.

87178291218 is a `hidden beast` number, since 8 + 71 + 78 + 291 + 218 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 87176696049 + 1595169 = 295257^2 + 1263^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87178291219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27207603 + ... + 27210806.

Almost surely, 2^87178291218 is an apocalyptic number.

87178291218 is an abundant number, since it is smaller than the sum of its proper divisors (103830327882).

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

87178291218 is a wasteful number, since it uses less digits than its factorization.

87178291218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54418506 (or 54418503 counting only the distinct ones).

The product of its digits is 903168, while the sum is 54.

The spelling of 87178291218 in words is "eighty-seven billion, one hundred seventy-eight million, two hundred ninety-one thousand, two hundred eighteen".