68690989 has 2 divisors, whose sum is σ = 68690990. Its totient is φ = 68690988.

The previous prime is 68690983. The next prime is 68691011. The reversal of 68690989 is 98909686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61308900 + 7382089 = 7830^2 + 2717^2 .

It is a cyclic number.

It is not a de Polignac number, because 68690989 - 2¹¹ = 68688941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68690983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34345494 + 34345495.

It is an arithmetic number, because the mean of its divisors is an integer number (34345495).

Almost surely, 2^68690989 is an apocalyptic number.

It is an amenable number.

68690989 is a deficient number, since it is larger than the sum of its proper divisors (1).

68690989 is an equidigital number, since it uses as much as digits as its factorization.

68690989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 68690989 is about 8288.0027147679. The cubic root of 68690989 is about 409.5433921308.

The spelling of 68690989 in words is "sixty-eight million, six hundred ninety thousand, nine hundred eighty-nine".