872143645 has 4 divisors (see below), whose sum is σ = 1046572380. Its totient is φ = 697714912.

The previous prime is 872143631. The next prime is 872143661. The reversal of 872143645 is 546341278.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 153313924 + 718829721 = 12382^2 + 26811^2 .

It is a cyclic number.

It is not a de Polignac number, because 872143645 - 2¹¹ = 872141597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 872143598 and 872143607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87214360 + ... + 87214369.

It is an arithmetic number, because the mean of its divisors is an integer number (261643095).

Almost surely, 2^872143645 is an apocalyptic number.

It is an amenable number.

872143645 is a deficient number, since it is larger than the sum of its proper divisors (174428735).

872143645 is a wasteful number, since it uses less digits than its factorization.

872143645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174428734.

The product of its digits is 161280, while the sum is 40.

The square root of 872143645 is about 29532.0782370628. The cubic root of 872143645 is about 955.4236929220.

The spelling of 872143645 in words is "eight hundred seventy-two million, one hundred forty-three thousand, six hundred forty-five".