68905489 has 2 divisors, whose sum is σ = 68905490. Its totient is φ = 68905488.

The previous prime is 68905481. The next prime is 68905517. The reversal of 68905489 is 98450986.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68757264 + 148225 = 8292^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 68905489 - 2³ = 68905481 is a prime.

It is not a weakly prime, because it can be changed into another prime (68905481) 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, 34452744 + 34452745.

It is an arithmetic number, because the mean of its divisors is an integer number (34452745).

Almost surely, 2^68905489 is an apocalyptic number.

It is an amenable number.

68905489 is a deficient number, since it is larger than the sum of its proper divisors (1).

68905489 is an equidigital number, since it uses as much as digits as its factorization.

68905489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 68905489 is about 8300.9330198478. The cubic root of 68905489 is about 409.9692402067.

The spelling of 68905489 in words is "sixty-eight million, nine hundred five thousand, four hundred eighty-nine".