2778791263 has 4 divisors (see below), whose sum is σ = 2825889480. Its totient is φ = 2731693048.

The previous prime is 2778791243. The next prime is 2778791311. The reversal of 2778791263 is 3621978772.

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

It is a cyclic number.

It is not a de Polignac number, because 2778791263 - 2¹³ = 2778783071 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 2778791263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778791233) 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 3 ways as a sum of consecutive naturals, for example, 23549020 + ... + 23549137.

It is an arithmetic number, because the mean of its divisors is an integer number (706472370).

Almost surely, 2^2778791263 is an apocalyptic number.

2778791263 is a deficient number, since it is larger than the sum of its proper divisors (47098217).

2778791263 is an equidigital number, since it uses as much as digits as its factorization.

2778791263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47098216.

The product of its digits is 1778112, while the sum is 52.

The square root of 2778791263 is about 52714.2415576664. The cubic root of 2778791263 is about 1405.8920493569.

The spelling of 2778791263 in words is "two billion, seven hundred seventy-eight million, seven hundred ninety-one thousand, two hundred sixty-three".