2857870861 has 16 divisors (see below), whose sum is σ = 3014634240. Its totient is φ = 2705970240.

The previous prime is 2857870849. The next prime is 2857870871. The reversal of 2857870861 is 1680787582.

It is a happy number.

2857870861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2857870861 - 2⁹ = 2857870349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2857870799 and 2857870808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2857870831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306691 + ... + 315871.

It is an arithmetic number, because the mean of its divisors is an integer number (188414640).

Almost surely, 2^2857870861 is an apocalyptic number.

It is an amenable number.

2857870861 is a deficient number, since it is larger than the sum of its proper divisors (156763379).

2857870861 is a wasteful number, since it uses less digits than its factorization.

2857870861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9444.

The product of its (nonzero) digits is 1505280, while the sum is 52.

The square root of 2857870861 is about 53459.0578012744. The cubic root of 2857870861 is about 1419.1039213653.

The spelling of 2857870861 in words is "two billion, eight hundred fifty-seven million, eight hundred seventy thousand, eight hundred sixty-one".