67642889 has 2 divisors, whose sum is σ = 67642890. Its totient is φ = 67642888.

The previous prime is 67642873. The next prime is 67642903. The reversal of 67642889 is 98824676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62283664 + 5359225 = 7892^2 + 2315^2 .

It is a cyclic number.

It is not a de Polignac number, because 67642889 - 2⁴ = 67642873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67642789) 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, 33821444 + 33821445.

It is an arithmetic number, because the mean of its divisors is an integer number (33821445).

Almost surely, 2^67642889 is an apocalyptic number.

It is an amenable number.

67642889 is a deficient number, since it is larger than the sum of its proper divisors (1).

67642889 is an equidigital number, since it uses as much as digits as its factorization.

67642889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 50.

The square root of 67642889 is about 8224.5297129988. The cubic root of 67642889 is about 407.4497440125.

The spelling of 67642889 in words is "sixty-seven million, six hundred forty-two thousand, eight hundred eighty-nine".