2778085778 has 16 divisors (see below), whose sum is σ = 4592043456. Its totient is φ = 1252374480.

The previous prime is 2778085771. The next prime is 2778085819. The reversal of 2778085778 is 8775808772.

It is not an unprimeable number, because it can be changed into a prime (2778085771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1241318 + ... + 1243553.

It is an arithmetic number, because the mean of its divisors is an integer number (287002716).

Almost surely, 2^2778085778 is an apocalyptic number.

2778085778 is a deficient number, since it is larger than the sum of its proper divisors (1813957678).

2778085778 is a wasteful number, since it uses less digits than its factorization.

2778085778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484929.

The product of its (nonzero) digits is 12293120, while the sum is 59.

The square root of 2778085778 is about 52707.5495351472. The cubic root of 2778085778 is about 1405.7730624058.

The spelling of 2778085778 in words is "two billion, seven hundred seventy-eight million, eighty-five thousand, seven hundred seventy-eight".