68857889 has 2 divisors, whose sum is σ = 68857890. Its totient is φ = 68857888.

The previous prime is 68857847. The next prime is 68857891. The reversal of 68857889 is 98875886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41473600 + 27384289 = 6440^2 + 5233^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68857889 is a prime.

Together with 68857891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68857489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34428944 + 34428945.

It is an arithmetic number, because the mean of its divisors is an integer number (34428945).

Almost surely, 2^68857889 is an apocalyptic number.

It is an amenable number.

68857889 is a deficient number, since it is larger than the sum of its proper divisors (1).

68857889 is an equidigital number, since it uses as much as digits as its factorization.

68857889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7741440, while the sum is 59.

The square root of 68857889 is about 8298.0653769418. The cubic root of 68857889 is about 409.8748160353.

The spelling of 68857889 in words is "sixty-eight million, eight hundred fifty-seven thousand, eight hundred eighty-nine".