2689768985 has 8 divisors (see below), whose sum is σ = 3417588936. Its totient is φ = 2025237760.

The previous prime is 2689768979. The next prime is 2689768997. The reversal of 2689768985 is 5898679862.

It can be written as a sum of positive squares in 4 ways, for example, as 349241344 + 2340527641 = 18688^2 + 48379^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2689768985 - 2¹⁰ = 2689767961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15822086 + ... + 15822255.

It is an arithmetic number, because the mean of its divisors is an integer number (427198617).

Almost surely, 2^2689768985 is an apocalyptic number.

It is an amenable number.

2689768985 is a deficient number, since it is larger than the sum of its proper divisors (727819951).

2689768985 is a wasteful number, since it uses less digits than its factorization.

2689768985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31644363.

The product of its digits is 104509440, while the sum is 68.

The square root of 2689768985 is about 51862.9828008378. The cubic root of 2689768985 is about 1390.7156029240.

The spelling of 2689768985 in words is "two billion, six hundred eighty-nine million, seven hundred sixty-eight thousand, nine hundred eighty-five".