68690449 has 2 divisors, whose sum is σ = 68690450. Its totient is φ = 68690448.

The previous prime is 68690431. The next prime is 68690471. The reversal of 68690449 is 94409686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68359824 + 330625 = 8268^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 68690449 - 2¹⁷ = 68559377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68690399 and 68690408.

It is not a weakly prime, because it can be changed into another prime (68690429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34345224 + 34345225.

It is an arithmetic number, because the mean of its divisors is an integer number (34345225).

Almost surely, 2^68690449 is an apocalyptic number.

It is an amenable number.

68690449 is a deficient number, since it is larger than the sum of its proper divisors (1).

68690449 is an equidigital number, since it uses as much as digits as its factorization.

68690449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 68690449 is about 8287.9701374945. The cubic root of 68690449 is about 409.5423189478.

The spelling of 68690449 in words is "sixty-eight million, six hundred ninety thousand, four hundred forty-nine".