68247989 has 2 divisors, whose sum is σ = 68247990. Its totient is φ = 68247988.

The previous prime is 68247983. The next prime is 68248007. The reversal of 68247989 is 98974286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60575089 + 7672900 = 7783^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 68247989 - 2⁴ = 68247973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68247989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68247983) 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, 34123994 + 34123995.

It is an arithmetic number, because the mean of its divisors is an integer number (34123995).

Almost surely, 2^68247989 is an apocalyptic number.

It is an amenable number.

68247989 is a deficient number, since it is larger than the sum of its proper divisors (1).

68247989 is an equidigital number, since it uses as much as digits as its factorization.

68247989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The square root of 68247989 is about 8261.2341087758. The cubic root of 68247989 is about 408.6610874389.

The spelling of 68247989 in words is "sixty-eight million, two hundred forty-seven thousand, nine hundred eighty-nine".