68715869 has 2 divisors, whose sum is σ = 68715870. Its totient is φ = 68715868.

The previous prime is 68715733. The next prime is 68715883. The reversal of 68715869 is 96851786.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61042969 + 7672900 = 7813^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 68715869 - 2¹⁶ = 68650333 is a prime.

It is a super-2 number, since 2×68715869² = 9443741304850322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68715169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34357934 + 34357935.

It is an arithmetic number, because the mean of its divisors is an integer number (34357935).

Almost surely, 2^68715869 is an apocalyptic number.

It is an amenable number.

68715869 is a deficient number, since it is larger than the sum of its proper divisors (1).

68715869 is an equidigital number, since it uses as much as digits as its factorization.

68715869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 50.

The square root of 68715869 is about 8289.5035436388. The cubic root of 68715869 is about 409.5928319471.

The spelling of 68715869 in words is "sixty-eight million, seven hundred fifteen thousand, eight hundred sixty-nine".