2857978211 has 4 divisors (see below), whose sum is σ = 3117794424. Its totient is φ = 2598162000.

The previous prime is 2857978177. The next prime is 2857978241. The reversal of 2857978211 is 1128797582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2857978211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2857978211.

It is not an unprimeable number, because it can be changed into a prime (2857978241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129908090 + ... + 129908111.

It is an arithmetic number, because the mean of its divisors is an integer number (779448606).

Almost surely, 2^2857978211 is an apocalyptic number.

2857978211 is a deficient number, since it is larger than the sum of its proper divisors (259816213).

2857978211 is a wasteful number, since it uses less digits than its factorization.

2857978211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259816212.

The product of its digits is 564480, while the sum is 50.

The square root of 2857978211 is about 53460.0618312400. The cubic root of 2857978211 is about 1419.1216897094.

The spelling of 2857978211 in words is "two billion, eight hundred fifty-seven million, nine hundred seventy-eight thousand, two hundred eleven".