2871939665 has 32 divisors (see below), whose sum is σ = 4111534080. Its totient is φ = 1884326400.

The previous prime is 2871939607. The next prime is 2871939691. The reversal of 2871939665 is 5669391782.

It is a happy number.

It is not a de Polignac number, because 2871939665 - 2¹⁸ = 2871677521 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2871939665.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81695 + ... + 111435.

It is an arithmetic number, because the mean of its divisors is an integer number (128485440).

Almost surely, 2^2871939665 is an apocalyptic number.

It is an amenable number.

2871939665 is a deficient number, since it is larger than the sum of its proper divisors (1239594415).

2871939665 is a wasteful number, since it uses less digits than its factorization.

2871939665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29873.

The product of its digits is 4898880, while the sum is 56.

The square root of 2871939665 is about 53590.4811043902. The cubic root of 2871939665 is about 1421.4287782992.

The spelling of 2871939665 in words is "two billion, eight hundred seventy-one million, nine hundred thirty-nine thousand, six hundred sixty-five".