2686388689 has 4 divisors (see below), whose sum is σ = 2689452724. Its totient is φ = 2683324656.

The previous prime is 2686388659. The next prime is 2686388717. The reversal of 2686388689 is 9868836862.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2490808464 + 195580225 = 49908^2 + 13985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2686388689 - 2⁷ = 2686388561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2686388689.

It is not an unprimeable number, because it can be changed into a prime (2686388609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1530702 + ... + 1532455.

It is an arithmetic number, because the mean of its divisors is an integer number (672363181).

Almost surely, 2^2686388689 is an apocalyptic number.

It is an amenable number.

2686388689 is a deficient number, since it is larger than the sum of its proper divisors (3064035).

2686388689 is an equidigital number, since it uses as much as digits as its factorization.

2686388689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064034.

The product of its digits is 47775744, while the sum is 64.

The square root of 2686388689 is about 51830.3838399833. The cubic root of 2686388689 is about 1390.1327770270.

The spelling of 2686388689 in words is "two billion, six hundred eighty-six million, three hundred eighty-eight thousand, six hundred eighty-nine".