871549980 has 96 divisors (see below), whose sum is σ = 2796519936. Its totient is φ = 198671616.

The previous prime is 871549957. The next prime is 871549981. The reversal of 871549980 is 89945178.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871549981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164127 + ... + 169353.

It is an arithmetic number, because the mean of its divisors is an integer number (29130416).

Almost surely, 2^871549980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 871549980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1398259968).

871549980 is an abundant number, since it is smaller than the sum of its proper divisors (1924969956).

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

871549980 is a wasteful number, since it uses less digits than its factorization.

871549980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5643 (or 5641 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 871549980 is about 29522.0253370259. The cubic root of 871549980 is about 955.2068592402.

The spelling of 871549980 in words is "eight hundred seventy-one million, five hundred forty-nine thousand, nine hundred eighty".