2089857865 has 16 divisors (see below), whose sum is σ = 2617845840. Its totient is φ = 1600024320.

The previous prime is 2089857857. The next prime is 2089857883. The reversal of 2089857865 is 5687589802.

It can be written as a sum of positive squares in 8 ways, for example, as 88906041 + 2000951824 = 9429^2 + 44732^2 .

It is not a de Polignac number, because 2089857865 - 2³ = 2089857857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81310 + ... + 103879.

It is an arithmetic number, because the mean of its divisors is an integer number (163615365).

Almost surely, 2^2089857865 is an apocalyptic number.

It is an amenable number.

2089857865 is a deficient number, since it is larger than the sum of its proper divisors (527987975).

2089857865 is a wasteful number, since it uses less digits than its factorization.

2089857865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185292.

The product of its (nonzero) digits is 9676800, while the sum is 58.

The square root of 2089857865 is about 45714.9632505594. The cubic root of 2089857865 is about 1278.5142806008.

The spelling of 2089857865 in words is "two billion, eighty-nine million, eight hundred fifty-seven thousand, eight hundred sixty-five".