2688779939 has 2 divisors, whose sum is σ = 2688779940. Its totient is φ = 2688779938.

The previous prime is 2688779923. The next prime is 2688779983. The reversal of 2688779939 is 9399778862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2688779939 - 2⁴ = 2688779923 is a prime.

It is not a weakly prime, because it can be changed into another prime (2688779909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344389969 + 1344389970.

It is an arithmetic number, because the mean of its divisors is an integer number (1344389970).

Almost surely, 2^2688779939 is an apocalyptic number.

2688779939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2688779939 is an equidigital number, since it uses as much as digits as its factorization.

2688779939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82301184, while the sum is 68.

The square root of 2688779939 is about 51853.4467417548. The cubic root of 2688779939 is about 1390.5451235585.

The spelling of 2688779939 in words is "two billion, six hundred eighty-eight million, seven hundred seventy-nine thousand, nine hundred thirty-nine".