68636489 has 2 divisors, whose sum is σ = 68636490. Its totient is φ = 68636488.

The previous prime is 68636483. The next prime is 68636507. The reversal of 68636489 is 98463686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40195600 + 28440889 = 6340^2 + 5333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68636489 is a prime.

It is not a weakly prime, because it can be changed into another prime (68636483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34318244 + 34318245.

It is an arithmetic number, because the mean of its divisors is an integer number (34318245).

Almost surely, 2^68636489 is an apocalyptic number.

It is an amenable number.

68636489 is a deficient number, since it is larger than the sum of its proper divisors (1).

68636489 is an equidigital number, since it uses as much as digits as its factorization.

68636489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 50.

The square root of 68636489 is about 8284.7141773268. The cubic root of 68636489 is about 409.4350517658.

The spelling of 68636489 in words is "sixty-eight million, six hundred thirty-six thousand, four hundred eighty-nine".