871440645 has 16 divisors (see below), whose sum is σ = 1397535552. Its totient is φ = 463691520.

The previous prime is 871440637. The next prime is 871440653. The reversal of 871440645 is 546044178.

It is an interprime number because it is at equal distance from previous prime (871440637) and next prime (871440653).

It is not a de Polignac number, because 871440645 - 2³ = 871440637 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 60591 + ... + 73580.

It is an arithmetic number, because the mean of its divisors is an integer number (87345972).

Almost surely, 2^871440645 is an apocalyptic number.

It is an amenable number.

871440645 is a deficient number, since it is larger than the sum of its proper divisors (526094907).

871440645 is a wasteful number, since it uses less digits than its factorization.

871440645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134612.

The product of its (nonzero) digits is 107520, while the sum is 39.

The square root of 871440645 is about 29520.1735259127. The cubic root of 871440645 is about 955.1669143482.

The spelling of 871440645 in words is "eight hundred seventy-one million, four hundred forty thousand, six hundred forty-five".