67047989 has 2 divisors, whose sum is σ = 67047990. Its totient is φ = 67047988.

The previous prime is 67047973. The next prime is 67048073. The reversal of 67047989 is 98974076.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66699889 + 348100 = 8167^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 67047989 - 2⁴ = 67047973 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 (67047919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33523994 + 33523995.

It is an arithmetic number, because the mean of its divisors is an integer number (33523995).

Almost surely, 2^67047989 is an apocalyptic number.

It is an amenable number.

67047989 is a deficient number, since it is larger than the sum of its proper divisors (1).

67047989 is an equidigital number, since it uses as much as digits as its factorization.

67047989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 67047989 is about 8188.2836418874. The cubic root of 67047989 is about 406.2517568681.

The spelling of 67047989 in words is "sixty-seven million, forty-seven thousand, nine hundred eighty-nine".