68688769 has 2 divisors, whose sum is σ = 68688770. Its totient is φ = 68688768.

The previous prime is 68688709. The next prime is 68688799. The reversal of 68688769 is 96788686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68674369 + 14400 = 8287^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 68688769 - 2¹¹ = 68686721 is a prime.

It is a super-2 number, since 2×68688769² = 9436293973470722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68688709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34344384 + 34344385.

It is an arithmetic number, because the mean of its divisors is an integer number (34344385).

Almost surely, 2^68688769 is an apocalyptic number.

It is an amenable number.

68688769 is a deficient number, since it is larger than the sum of its proper divisors (1).

68688769 is an equidigital number, since it uses as much as digits as its factorization.

68688769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 58.

The square root of 68688769 is about 8287.8687851582. The cubic root of 68688769 is about 409.5389801202.

The spelling of 68688769 in words is "sixty-eight million, six hundred eighty-eight thousand, seven hundred sixty-nine".