68669989 has 2 divisors, whose sum is σ = 68669990. Its totient is φ = 68669988.

The previous prime is 68669983. The next prime is 68670023. The reversal of 68669989 is 98996686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66552964 + 2117025 = 8158^2 + 1455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68669989 is a prime.

68669989 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68669983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34334994 + 34334995.

It is an arithmetic number, because the mean of its divisors is an integer number (34334995).

Almost surely, 2^68669989 is an apocalyptic number.

It is an amenable number.

68669989 is a deficient number, since it is larger than the sum of its proper divisors (1).

68669989 is an equidigital number, since it uses as much as digits as its factorization.

68669989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10077696, while the sum is 61.

The square root of 68669989 is about 8286.7357264486. The cubic root of 68669989 is about 409.5016530908.

The spelling of 68669989 in words is "sixty-eight million, six hundred sixty-nine thousand, nine hundred eighty-nine".