871638056 has 8 divisors (see below), whose sum is σ = 1634321370. Its totient is φ = 435819024.

The previous prime is 871638037. The next prime is 871638083. The reversal of 871638056 is 650836178.

It can be written as a sum of positive squares in only one way, i.e., 468029956 + 403608100 = 21634^2 + 20090^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 871637998 and 871638016.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54477371 + ... + 54477386.

Almost surely, 2^871638056 is an apocalyptic number.

It is an amenable number.

871638056 is a deficient number, since it is larger than the sum of its proper divisors (762683314).

871638056 is a wasteful number, since it uses less digits than its factorization.

871638056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108954763 (or 108954759 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 871638056 is about 29523.5169991653. The cubic root of 871638056 is about 955.2390348536.

The spelling of 871638056 in words is "eight hundred seventy-one million, six hundred thirty-eight thousand, fifty-six".