871720844 has 24 divisors (see below), whose sum is σ = 1595982528. Its totient is φ = 416178560.

The previous prime is 871720841. The next prime is 871720867. The reversal of 871720844 is 448027178.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (871720841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48839 + ... + 64254.

It is an arithmetic number, because the mean of its divisors is an integer number (66499272).

Almost surely, 2^871720844 is an apocalyptic number.

It is an amenable number.

871720844 is a deficient number, since it is larger than the sum of its proper divisors (724261684).

871720844 is a wasteful number, since it uses less digits than its factorization.

871720844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113185 (or 113183 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 41.

The square root of 871720844 is about 29524.9190346053. The cubic root of 871720844 is about 955.2692766973.

The spelling of 871720844 in words is "eight hundred seventy-one million, seven hundred twenty thousand, eight hundred forty-four".