67939889 has 2 divisors, whose sum is σ = 67939890. Its totient is φ = 67939888.

The previous prime is 67939831. The next prime is 67939891. The reversal of 67939889 is 98893976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44823025 + 23116864 = 6695^2 + 4808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67939889 is a prime.

Together with 67939891, 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 (67939819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33969944 + 33969945.

It is an arithmetic number, because the mean of its divisors is an integer number (33969945).

Almost surely, 2^67939889 is an apocalyptic number.

It is an amenable number.

67939889 is a deficient number, since it is larger than the sum of its proper divisors (1).

67939889 is an equidigital number, since it uses as much as digits as its factorization.

67939889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 59.

The square root of 67939889 is about 8242.5656806604. The cubic root of 67939889 is about 408.0452039656.

The spelling of 67939889 in words is "sixty-seven million, nine hundred thirty-nine thousand, eight hundred eighty-nine".