2778640267 has 16 divisors (see below), whose sum is σ = 3094002688. Its totient is φ = 2478068640.

The previous prime is 2778640247. The next prime is 2778640279. The reversal of 2778640267 is 7620468772.

It is a cyclic number.

It is not a de Polignac number, because 2778640267 - 2¹⁵ = 2778607499 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 2778640267.

It is not an unprimeable number, because it can be changed into a prime (2778640247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253768 + ... + 264490.

It is an arithmetic number, because the mean of its divisors is an integer number (193375168).

Almost surely, 2^2778640267 is an apocalyptic number.

2778640267 is a deficient number, since it is larger than the sum of its proper divisors (315362421).

2778640267 is a wasteful number, since it uses less digits than its factorization.

2778640267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11410.

The product of its (nonzero) digits is 1580544, while the sum is 49.

The square root of 2778640267 is about 52712.8093256279. The cubic root of 2778640267 is about 1405.8665840975.

The spelling of 2778640267 in words is "two billion, seven hundred seventy-eight million, six hundred forty thousand, two hundred sixty-seven".