68204989 has 2 divisors, whose sum is σ = 68204990. Its totient is φ = 68204988.

The previous prime is 68204977. The next prime is 68204999. The reversal of 68204989 is 98940286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56881764 + 11323225 = 7542^2 + 3365^2 .

It is a cyclic number.

It is not a de Polignac number, because 68204989 - 2⁵ = 68204957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68204909) 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, 34102494 + 34102495.

It is an arithmetic number, because the mean of its divisors is an integer number (34102495).

Almost surely, 2^68204989 is an apocalyptic number.

It is an amenable number.

68204989 is a deficient number, since it is larger than the sum of its proper divisors (1).

68204989 is an equidigital number, since it uses as much as digits as its factorization.

68204989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 68204989 is about 8258.6311819817. The cubic root of 68204989 is about 408.5752430605.

The spelling of 68204989 in words is "sixty-eight million, two hundred four thousand, nine hundred eighty-nine".