68609609 has 2 divisors, whose sum is σ = 68609610. Its totient is φ = 68609608.

The previous prime is 68609587. The next prime is 68609633. The reversal of 68609609 is 90690686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64000000 + 4609609 = 8000^2 + 2147^2 .

It is a cyclic number.

It is not a de Polignac number, because 68609609 - 2⁸ = 68609353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68609609.

It is not a weakly prime, because it can be changed into another prime (68609659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34304804 + 34304805.

It is an arithmetic number, because the mean of its divisors is an integer number (34304805).

Almost surely, 2^68609609 is an apocalyptic number.

It is an amenable number.

68609609 is a deficient number, since it is larger than the sum of its proper divisors (1).

68609609 is an equidigital number, since it uses as much as digits as its factorization.

68609609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 68609609 is about 8283.0917536871. The cubic root of 68609609 is about 409.3815959856.

The spelling of 68609609 in words is "sixty-eight million, six hundred nine thousand, six hundred nine".