2864870861 has 4 divisors (see below), whose sum is σ = 2865028224. Its totient is φ = 2864713500.

The previous prime is 2864870849. The next prime is 2864870881. The reversal of 2864870861 is 1680784682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2864870861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2864870881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47165 + ... + 89186.

It is an arithmetic number, because the mean of its divisors is an integer number (716257056).

Almost surely, 2^2864870861 is an apocalyptic number.

It is an amenable number.

2864870861 is a deficient number, since it is larger than the sum of its proper divisors (157363).

2864870861 is a wasteful number, since it uses less digits than its factorization.

2864870861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157362.

The product of its (nonzero) digits is 1032192, while the sum is 50.

The square root of 2864870861 is about 53524.4884235244. The cubic root of 2864870861 is about 1420.2616163153.

The spelling of 2864870861 in words is "two billion, eight hundred sixty-four million, eight hundred seventy thousand, eight hundred sixty-one".