871287122178 has 270 divisors, whose sum is σ = 2202425362137. Its totient is φ = 257254462080.

The previous prime is 871287122177. The next prime is 871287122227. The reversal of 871287122178 is 871221782178.

871287122178 is a `hidden beast` number, since 8 + 71 + 287 + 1 + 221 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 550277625249 + 321009496929 = 741807^2 + 566577^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=660033.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (871287122177) 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 134 ways as a sum of consecutive naturals, for example, 7710505450 + ... + 7710505562.

Almost surely, 2^871287122178 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 871287122178

871287122178 is an abundant number, since it is smaller than the sum of its proper divisors (1331138239959).

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

871287122178 is a wasteful number, since it uses less digits than its factorization.

871287122178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 188 counting only the distinct ones).

The product of its digits is 1404928, while the sum is 54.

The spelling of 871287122178 in words is "eight hundred seventy-one billion, two hundred eighty-seven million, one hundred twenty-two thousand, one hundred seventy-eight".