664570 has 8 divisors (see below), whose sum is σ = 1196244. Its totient is φ = 265824.

The previous prime is 664561. The next prime is 664571. The reversal of 664570 is 75466.

It can be written as a sum of positive squares in 2 ways, for example, as 628849 + 35721 = 793^2 + 189^2 .

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

It is not an unprimeable number, because it can be changed into a prime (664571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33219 + ... + 33238.

2⁶⁶⁴⁵⁷⁰ is an apocalyptic number.

664570 is a deficient number, since it is larger than the sum of its proper divisors (531674).

664570 is a wasteful number, since it uses less digits than its factorization.

664570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66464.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 664570 is about 815.2116289651. The cubic root of 664570 is about 87.2663699467.

The spelling of 664570 in words is "six hundred sixty-four thousand, five hundred seventy".