667447289 has 8 divisors (see below), whose sum is σ = 676517448. Its totient is φ = 658425600.

The previous prime is 667447283. The next prime is 667447309. The reversal of 667447289 is 982744766.

It can be written as a sum of positive squares in 4 ways, for example, as 34421689 + 633025600 = 5867^2 + 25160^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667447289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 667447289.

It is not an unprimeable number, because it can be changed into a prime (667447283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16049 + ... + 39905.

It is an arithmetic number, because the mean of its divisors is an integer number (84564681).

Almost surely, 2^667447289 is an apocalyptic number.

It is an amenable number.

667447289 is a deficient number, since it is larger than the sum of its proper divisors (9070159).

667447289 is a wasteful number, since it uses less digits than its factorization.

667447289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24235.

The product of its digits is 4064256, while the sum is 53.

The square root of 667447289 is about 25835.0012386297. The cubic root of 667447289 is about 873.9212999495.

The spelling of 667447289 in words is "six hundred sixty-seven million, four hundred forty-seven thousand, two hundred eighty-nine".