67980217 has 2 divisors, whose sum is σ = 67980218. Its totient is φ = 67980216.

The previous prime is 67980181. The next prime is 67980239. The reversal of 67980217 is 71208976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61136761 + 6843456 = 7819^2 + 2616^2 .

It is a cyclic number.

It is not a de Polignac number, because 67980217 - 2¹⁵ = 67947449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67980217.

It is not a weakly prime, because it can be changed into another prime (67980257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33990108 + 33990109.

It is an arithmetic number, because the mean of its divisors is an integer number (33990109).

Almost surely, 2^67980217 is an apocalyptic number.

It is an amenable number.

67980217 is a deficient number, since it is larger than the sum of its proper divisors (1).

67980217 is an equidigital number, since it uses as much as digits as its factorization.

67980217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 67980217 is about 8245.0116434120. The cubic root of 67980217 is about 408.1259243022.

The spelling of 67980217 in words is "sixty-seven million, nine hundred eighty thousand, two hundred seventeen".