871890045 has 32 divisors (see below), whose sum is σ = 1510182912. Its totient is φ = 426995712.

The previous prime is 871889989. The next prime is 871890053. The reversal of 871890045 is 540098178.

It is not a de Polignac number, because 871890045 - 2⁶ = 871889981 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 871889979 and 871890006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26052 + ... + 49218.

It is an arithmetic number, because the mean of its divisors is an integer number (47193216).

Almost surely, 2^871890045 is an apocalyptic number.

It is an amenable number.

871890045 is a deficient number, since it is larger than the sum of its proper divisors (638292867).

871890045 is a wasteful number, since it uses less digits than its factorization.

871890045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23381.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 871890045 is about 29527.7842887000. The cubic root of 871890045 is about 955.3310786153.

The spelling of 871890045 in words is "eight hundred seventy-one million, eight hundred ninety thousand, forty-five".