871788 has 12 divisors (see below), whose sum is σ = 2034200. Its totient is φ = 290592.

The previous prime is 871771. The next prime is 871789. The reversal of 871788 is 887178.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (871789) by changing a digit.

871788 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36313 + ... + 36336.

2⁸⁷¹⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

871788 is an abundant number, since it is smaller than the sum of its proper divisors (1162412).

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

871788 is a wasteful number, since it uses less digits than its factorization.

871788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72656 (or 72654 counting only the distinct ones).

The product of its digits is 25088, while the sum is 39.

The square root of 871788 is about 933.6958819659. The cubic root of 871788 is about 95.5293806881.

The spelling of 871788 in words is "eight hundred seventy-one thousand, seven hundred eighty-eight".