68783979289 has 9 divisors (see below), whose sum is σ = 69251595903. Its totient is φ = 68319504432.

The previous prime is 68783979283. The next prime is 68783979307. The reversal of 68783979289 is 98297938786.

The square root of 68783979289 is 262267.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 67253604889 + 1530374400 = 259333^2 + 39120^2 .

It is not a de Polignac number, because 68783979289 - 2³ = 68783979281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68783979281) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 42748717 + ... + 42750325.

It is an arithmetic number, because the mean of its divisors is an integer number (7694621767).

Almost surely, 2^68783979289 is an apocalyptic number.

68783979289 is the 262267-th square number.

68783979289 is the 131134-th centered octagonal number.

It is an amenable number.

68783979289 is a deficient number, since it is larger than the sum of its proper divisors (467616614).

68783979289 is an frugal number, since it uses more digits than its factorization.

68783979289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3544 (or 1772 counting only the distinct ones).

The product of its digits is 658409472, while the sum is 76.

The spelling of 68783979289 in words is "sixty-eight billion, seven hundred eighty-three million, nine hundred seventy-nine thousand, two hundred eighty-nine".