871521904 has 20 divisors (see below), whose sum is σ = 1842080760. Its totient is φ = 396146240.

The previous prime is 871521869. The next prime is 871521907. The reversal of 871521904 is 409125178.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871521907) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2475739 + ... + 2476090.

It is an arithmetic number, because the mean of its divisors is an integer number (92104038).

Almost surely, 2^871521904 is an apocalyptic number.

It is an amenable number.

871521904 is an abundant number, since it is smaller than the sum of its proper divisors (970558856).

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

871521904 is a wasteful number, since it uses less digits than its factorization.

871521904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4951848 (or 4951842 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 871521904 is about 29521.5498238151. The cubic root of 871521904 is about 955.1966021594.

The spelling of 871521904 in words is "eight hundred seventy-one million, five hundred twenty-one thousand, nine hundred four".