871864643 has 16 divisors (see below), whose sum is σ = 956459616. Its totient is φ = 789834240.

The previous prime is 871864639. The next prime is 871864649. The reversal of 871864643 is 346468178.

It is a happy number.

It is not a de Polignac number, because 871864643 - 2² = 871864639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (871864649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464555 + ... + 466427.

It is an arithmetic number, because the mean of its divisors is an integer number (59778726).

Almost surely, 2^871864643 is an apocalyptic number.

871864643 is a deficient number, since it is larger than the sum of its proper divisors (84594973).

871864643 is a wasteful number, since it uses less digits than its factorization.

871864643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534.

The product of its digits is 774144, while the sum is 47.

The square root of 871864643 is about 29527.3541483147. The cubic root of 871864643 is about 955.3218008568.

The spelling of 871864643 in words is "eight hundred seventy-one million, eight hundred sixty-four thousand, six hundred forty-three".