871541820 has 36 divisors (see below), whose sum is σ = 2643677400. Its totient is φ = 232411104.

The previous prime is 871541791. The next prime is 871541833. The reversal of 871541820 is 28145178.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2420770 + ... + 2421129.

Almost surely, 2^871541820 is an apocalyptic number.

It is an amenable number.

871541820 is an abundant number, since it is smaller than the sum of its proper divisors (1772135580).

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

871541820 is a wasteful number, since it uses less digits than its factorization.

871541820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4841914 (or 4841909 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 871541820 is about 29521.8871348022. The cubic root of 871541820 is about 955.2038781481.

Adding to 871541820 its reverse (28145178), we get a palindrome (899686998).

The spelling of 871541820 in words is "eight hundred seventy-one million, five hundred forty-one thousand, eight hundred twenty".