871235920 has 20 divisors (see below), whose sum is σ = 2025623700. Its totient is φ = 348494336.

The previous prime is 871235887. The next prime is 871235923. The reversal of 871235920 is 29532178.

It can be written as a sum of positive squares in 2 ways, for example, as 87459904 + 783776016 = 9352^2 + 27996^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 871235920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871235923) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 5445145 + ... + 5445304.

It is an arithmetic number, because the mean of its divisors is an integer number (101281185).

Almost surely, 2^871235920 is an apocalyptic number.

871235920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

871235920 is an abundant number, since it is smaller than the sum of its proper divisors (1154387780).

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

871235920 is a wasteful number, since it uses less digits than its factorization.

871235920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10890462 (or 10890456 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 871235920 is about 29516.7057782538. The cubic root of 871235920 is about 955.0921103010.

The spelling of 871235920 in words is "eight hundred seventy-one million, two hundred thirty-five thousand, nine hundred twenty".