871811646 has 16 divisors (see below), whose sum is σ = 1846189584. Its totient is φ = 273509504.

The previous prime is 871811639. The next prime is 871811651. The reversal of 871811646 is 646118178.

It is a super-2 number, since 2×871811646² = 1520111092202458632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 871811598 and 871811607.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 4273485 + ... + 4273688.

It is an arithmetic number, because the mean of its divisors is an integer number (115386849).

Almost surely, 2^871811646 is an apocalyptic number.

871811646 is an abundant number, since it is smaller than the sum of its proper divisors (974377938).

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

871811646 is a wasteful number, since it uses less digits than its factorization.

871811646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8547195.

The product of its digits is 64512, while the sum is 42.

The square root of 871811646 is about 29526.4567125824. The cubic root of 871811646 is about 955.3024437942.

The spelling of 871811646 in words is "eight hundred seventy-one million, eight hundred eleven thousand, six hundred forty-six".