2783278879 has 4 divisors (see below), whose sum is σ = 2947001184. Its totient is φ = 2619556576.

The previous prime is 2783278819. The next prime is 2783278889. The reversal of 2783278879 is 9788723872.

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 2783278879 - 2⁹ = 2783278367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2783278819) 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, 81861127 + ... + 81861160.

It is an arithmetic number, because the mean of its divisors is an integer number (736750296).

Almost surely, 2^2783278879 is an apocalyptic number.

2783278879 is a deficient number, since it is larger than the sum of its proper divisors (163722305).

2783278879 is a wasteful number, since it uses less digits than its factorization.

2783278879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163722304.

The product of its digits is 18966528, while the sum is 61.

The square root of 2783278879 is about 52756.7898852840. The cubic root of 2783278879 is about 1406.6484586252.

The spelling of 2783278879 in words is "two billion, seven hundred eighty-three million, two hundred seventy-eight thousand, eight hundred seventy-nine".