664570000 has 50 divisors (see below), whose sum is σ = 1609014638. Its totient is φ = 265824000.

The previous prime is 664569979. The next prime is 664570007. The reversal of 664570000 is 75466.

It can be written as a sum of positive squares in 5 ways, for example, as 368179344 + 296390656 = 19188^2 + 17216^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is not an unprimeable number, because it can be changed into a prime (664570007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 23229 + ... + 43228.

Almost surely, 2^664570000 is an apocalyptic number.

It is an amenable number.

664570000 is an abundant number, since it is smaller than the sum of its proper divisors (944444638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664570000 is an equidigital number, since it uses as much as digits as its factorization.

664570000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66485 (or 66464 counting only the distinct ones).

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

The square root of 664570000 is about 25779.2552258594. The cubic root of 664570000 is about 872.6636994674.

The spelling of 664570000 in words is "six hundred sixty-four million, five hundred seventy thousand".