2766390689 has 4 divisors (see below), whose sum is σ = 2771448624. Its totient is φ = 2761332756.

The previous prime is 2766390677. The next prime is 2766390713. The reversal of 2766390689 is 9860936672.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2766390689 - 2⁴ = 2766390673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2766390659) 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, 2528147 + ... + 2529240.

It is an arithmetic number, because the mean of its divisors is an integer number (692862156).

Almost surely, 2^2766390689 is an apocalyptic number.

It is an amenable number.

2766390689 is a deficient number, since it is larger than the sum of its proper divisors (5057935).

2766390689 is an equidigital number, since it uses as much as digits as its factorization.

2766390689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5057934.

The product of its (nonzero) digits is 5878656, while the sum is 56.

The square root of 2766390689 is about 52596.4893220070. The cubic root of 2766390689 is about 1403.7976295699.

The spelling of 2766390689 in words is "two billion, seven hundred sixty-six million, three hundred ninety thousand, six hundred eighty-nine".