67420909 has 2 divisors, whose sum is σ = 67420910. Its totient is φ = 67420908.

The previous prime is 67420907. The next prime is 67420931. The reversal of 67420909 is 90902476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43626025 + 23794884 = 6605^2 + 4878^2 .

It is a cyclic number.

It is not a de Polignac number, because 67420909 - 2¹ = 67420907 is a prime.

Together with 67420907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67420901) 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, 33710454 + 33710455.

It is an arithmetic number, because the mean of its divisors is an integer number (33710455).

Almost surely, 2^67420909 is an apocalyptic number.

It is an amenable number.

67420909 is a deficient number, since it is larger than the sum of its proper divisors (1).

67420909 is an equidigital number, since it uses as much as digits as its factorization.

67420909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 67420909 is about 8211.0236268080. The cubic root of 67420909 is about 407.0035536679.

The spelling of 67420909 in words is "sixty-seven million, four hundred twenty thousand, nine hundred nine".