2789391689 has 12 divisors (see below), whose sum is σ = 3252917268. Its totient is φ = 2384928000.

The previous prime is 2789391617. The next prime is 2789391701. The reversal of 2789391689 is 9861939872.

It can be written as a sum of positive squares in 2 ways, for example, as 2032206400 + 757185289 = 45080^2 + 27517^2 .

It is not a de Polignac number, because 2789391689 - 2¹² = 2789387593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2789391589) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51332 + ... + 90629.

It is an arithmetic number, because the mean of its divisors is an integer number (271076439).

Almost surely, 2^2789391689 is an apocalyptic number.

It is an amenable number.

2789391689 is a deficient number, since it is larger than the sum of its proper divisors (463525579).

2789391689 is a wasteful number, since it uses less digits than its factorization.

2789391689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142376 (or 142369 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 62.

The square root of 2789391689 is about 52814.6919805465. The cubic root of 2789391689 is about 1407.6774952278.

The spelling of 2789391689 in words is "two billion, seven hundred eighty-nine million, three hundred ninety-one thousand, six hundred eighty-nine".