68690689 has 4 divisors (see below), whose sum is σ = 68769540. Its totient is φ = 68611840.

The previous prime is 68690669. The next prime is 68690711. The reversal of 68690689 is 98609686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27217089 + 41473600 = 5217^2 + 6440^2 .

It is a cyclic number.

It is not a de Polignac number, because 68690689 - 2¹⁹ = 68166401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68690669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38104 + ... + 39865.

It is an arithmetic number, because the mean of its divisors is an integer number (17192385).

Almost surely, 2^68690689 is an apocalyptic number.

It is an amenable number.

68690689 is a deficient number, since it is larger than the sum of its proper divisors (78851).

68690689 is an equidigital number, since it uses as much as digits as its factorization.

68690689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78850.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 68690689 is about 8287.9846162985. The cubic root of 68690689 is about 409.5427959187.

The spelling of 68690689 in words is "sixty-eight million, six hundred ninety thousand, six hundred eighty-nine".