68808769 has 2 divisors, whose sum is σ = 68808770. Its totient is φ = 68808768.

The previous prime is 68808721. The next prime is 68808917. The reversal of 68808769 is 96780886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48441600 + 20367169 = 6960^2 + 4513^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68808769 is a prime.

It is a super-2 number, since 2×68808769² = 9469293382590722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68808269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34404384 + 34404385.

It is an arithmetic number, because the mean of its divisors is an integer number (34404385).

Almost surely, 2^68808769 is an apocalyptic number.

It is an amenable number.

68808769 is a deficient number, since it is larger than the sum of its proper divisors (1).

68808769 is an equidigital number, since it uses as much as digits as its factorization.

68808769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 68808769 is about 8295.1051229023. The cubic root of 68808769 is about 409.7773310050. Note that the first 3 decimals are identical.

The spelling of 68808769 in words is "sixty-eight million, eight hundred eight thousand, seven hundred sixty-nine".