68639089 has 2 divisors, whose sum is σ = 68639090. Its totient is φ = 68639088.

The previous prime is 68639069. The next prime is 68639093. The reversal of 68639089 is 98093686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66585600 + 2053489 = 8160^2 + 1433^2 .

It is a cyclic number.

It is not a de Polignac number, because 68639089 - 2¹³ = 68630897 is a prime.

It is a super-2 number, since 2×68639089² = 9422649077499842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68639069) 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, 34319544 + 34319545.

It is an arithmetic number, because the mean of its divisors is an integer number (34319545).

Almost surely, 2^68639089 is an apocalyptic number.

It is an amenable number.

68639089 is a deficient number, since it is larger than the sum of its proper divisors (1).

68639089 is an equidigital number, since it uses as much as digits as its factorization.

68639089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 68639089 is about 8284.8710913327. The cubic root of 68639089 is about 409.4402215995.

The spelling of 68639089 in words is "sixty-eight million, six hundred thirty-nine thousand, eighty-nine".