68481689 has 2 divisors, whose sum is σ = 68481690. Its totient is φ = 68481688.

The previous prime is 68481683. The next prime is 68481793. The reversal of 68481689 is 98618486.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64000000 + 4481689 = 8000^2 + 2117^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68481689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68481683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34240844 + 34240845.

It is an arithmetic number, because the mean of its divisors is an integer number (34240845).

Almost surely, 2^68481689 is an apocalyptic number.

It is an amenable number.

68481689 is a deficient number, since it is larger than the sum of its proper divisors (1).

68481689 is an equidigital number, since it uses as much as digits as its factorization.

68481689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 50.

The square root of 68481689 is about 8275.3663967223. The cubic root of 68481689 is about 409.1270122406.

The spelling of 68481689 in words is "sixty-eight million, four hundred eighty-one thousand, six hundred eighty-nine".