67984909 has 2 divisors, whose sum is σ = 67984910. Its totient is φ = 67984908.

The previous prime is 67984901. The next prime is 67984919. The reversal of 67984909 is 90948976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52969284 + 15015625 = 7278^2 + 3875^2 .

It is a cyclic number.

It is not a de Polignac number, because 67984909 - 2³ = 67984901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67984901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33992454 + 33992455.

It is an arithmetic number, because the mean of its divisors is an integer number (33992455).

Almost surely, 2^67984909 is an apocalyptic number.

It is an amenable number.

67984909 is a deficient number, since it is larger than the sum of its proper divisors (1).

67984909 is an equidigital number, since it uses as much as digits as its factorization.

67984909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 67984909 is about 8245.2961741832. The cubic root of 67984909 is about 408.1353137141.

The spelling of 67984909 in words is "sixty-seven million, nine hundred eighty-four thousand, nine hundred nine".