2856078561 has 32 divisors (see below), whose sum is σ = 4401589248. Its totient is φ = 1613557440.

The previous prime is 2856078559. The next prime is 2856078569. The reversal of 2856078561 is 1658706582.

It is not a de Polignac number, because 2856078561 - 2¹ = 2856078559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2856078561.

It is not an unprimeable number, because it can be changed into a prime (2856078569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1533771 + ... + 1535631.

It is an arithmetic number, because the mean of its divisors is an integer number (137549664).

Almost surely, 2^2856078561 is an apocalyptic number.

2856078561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2856078561 is a deficient number, since it is larger than the sum of its proper divisors (1545510687).

2856078561 is a wasteful number, since it uses less digits than its factorization.

2856078561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661.

The product of its (nonzero) digits is 806400, while the sum is 48.

The square root of 2856078561 is about 53442.2918763782. The cubic root of 2856078561 is about 1418.8071979217.

The spelling of 2856078561 in words is "two billion, eight hundred fifty-six million, seventy-eight thousand, five hundred sixty-one".