67780109 has 2 divisors, whose sum is σ = 67780110. Its totient is φ = 67780108.

The previous prime is 67780067. The next prime is 67780121. The reversal of 67780109 is 90108776.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50098084 + 17682025 = 7078^2 + 4205^2 .

It is a cyclic number.

It is not a de Polignac number, because 67780109 - 2⁸ = 67779853 is a prime.

It is a Sophie Germain 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 (67780159) 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, 33890054 + 33890055.

It is an arithmetic number, because the mean of its divisors is an integer number (33890055).

Almost surely, 2^67780109 is an apocalyptic number.

It is an amenable number.

67780109 is a deficient number, since it is larger than the sum of its proper divisors (1).

67780109 is an equidigital number, since it uses as much as digits as its factorization.

67780109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 67780109 is about 8232.8676049114. The cubic root of 67780109 is about 407.7250747030.

The spelling of 67780109 in words is "sixty-seven million, seven hundred eighty thousand, one hundred nine".