664420027 has 8 divisors (see below), whose sum is σ = 710757936. Its totient is φ = 618888192.

The previous prime is 664420019. The next prime is 664420093. The reversal of 664420027 is 720024466.

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 664420027 - 2³ = 664420019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664420007) 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, 199813 + ... + 203110.

It is an arithmetic number, because the mean of its divisors is an integer number (88844742).

Almost surely, 2^664420027 is an apocalyptic number.

664420027 is a deficient number, since it is larger than the sum of its proper divisors (46337909).

664420027 is a wasteful number, since it uses less digits than its factorization.

664420027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403037.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 664420027 is about 25776.3462693998. The cubic root of 664420027 is about 872.5980500805.

The spelling of 664420027 in words is "six hundred sixty-four million, four hundred twenty thousand, twenty-seven".