67719989 has 2 divisors, whose sum is σ = 67719990. Its totient is φ = 67719988.

The previous prime is 67719973. The next prime is 67720001. The reversal of 67719989 is 98991776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66699889 + 1020100 = 8167^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 67719989 - 2⁴ = 67719973 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67719689) 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, 33859994 + 33859995.

It is an arithmetic number, because the mean of its divisors is an integer number (33859995).

Almost surely, 2^67719989 is an apocalyptic number.

It is an amenable number.

67719989 is a deficient number, since it is larger than the sum of its proper divisors (1).

67719989 is an equidigital number, since it uses as much as digits as its factorization.

67719989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 56.

The square root of 67719989 is about 8229.2155762260. The cubic root of 67719989 is about 407.6044902482.

The spelling of 67719989 in words is "sixty-seven million, seven hundred nineteen thousand, nine hundred eighty-nine".