871899644 has 24 divisors (see below), whose sum is σ = 1902327168. Its totient is φ = 339701040.

The previous prime is 871899643. The next prime is 871899653. The reversal of 871899644 is 446998178.

It is a self number, because there is not a number n which added to its sum of digits gives 871899644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871899643) 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 7 ways as a sum of consecutive naturals, for example, 1415114 + ... + 1415729.

It is an arithmetic number, because the mean of its divisors is an integer number (79263632).

Almost surely, 2^871899644 is an apocalyptic number.

It is an amenable number.

871899644 is an abundant number, since it is smaller than the sum of its proper divisors (1030427524).

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

871899644 is a wasteful number, since it uses less digits than its factorization.

871899644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830865 (or 2830863 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 56.

The square root of 871899644 is about 29527.9468300795. The cubic root of 871899644 is about 955.3345844814.

The spelling of 871899644 in words is "eight hundred seventy-one million, eight hundred ninety-nine thousand, six hundred forty-four".