664445627 has 8 divisors (see below), whose sum is σ = 686762496. Its totient is φ = 642469672.

The previous prime is 664445623. The next prime is 664445641. The reversal of 664445627 is 726544466.

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 664445627 - 2² = 664445623 is a prime.

It is a super-4 number, since 4×664445627⁴ (a number of 36 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (664445623) 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, 81263 + ... + 89064.

It is an arithmetic number, because the mean of its divisors is an integer number (85845312).

Almost surely, 2^664445627 is an apocalyptic number.

664445627 is a deficient number, since it is larger than the sum of its proper divisors (22316869).

664445627 is a wasteful number, since it uses less digits than its factorization.

664445627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170457.

The product of its digits is 967680, while the sum is 44.

The square root of 664445627 is about 25776.8428439171. The cubic root of 664445627 is about 872.6092569589.

The spelling of 664445627 in words is "six hundred sixty-four million, four hundred forty-five thousand, six hundred twenty-seven".