664304189 has 8 divisors (see below), whose sum is σ = 727635960. Its totient is φ = 603667456.

The previous prime is 664304183. The next prime is 664304191. The reversal of 664304189 is 981403466.

It can be written as a sum of positive squares in 4 ways, for example, as 290191225 + 374112964 = 17035^2 + 19342^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 664304189 - 2¹² = 664300093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664304183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673244 + ... + 674229.

It is an arithmetic number, because the mean of its divisors is an integer number (90954495).

Almost surely, 2^664304189 is an apocalyptic number.

It is an amenable number.

664304189 is a deficient number, since it is larger than the sum of its proper divisors (63331771).

664304189 is a wasteful number, since it uses less digits than its factorization.

664304189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347519.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 664304189 is about 25774.0991889144. The cubic root of 664304189 is about 872.5473362331.

The spelling of 664304189 in words is "six hundred sixty-four million, three hundred four thousand, one hundred eighty-nine".