664343020 has 96 divisors (see below), whose sum is σ = 1625702400. Its totient is φ = 225657600.

The previous prime is 664343011. The next prime is 664343021. The reversal of 664343020 is 20343466.

664343020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 664343020.

It is not an unprimeable number, because it can be changed into a prime (664343021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196101 + ... + 199459.

It is an arithmetic number, because the mean of its divisors is an integer number (16934400).

Almost surely, 2^664343020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664343020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812851200).

664343020 is an abundant number, since it is smaller than the sum of its proper divisors (961359380).

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

664343020 is a wasteful number, since it uses less digits than its factorization.

664343020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439 (or 3437 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 664343020 is about 25774.8524729047. The cubic root of 664343020 is about 872.5643370920.

Adding to 664343020 its reverse (20343466), we get a palindrome (684686486).

The spelling of 664343020 in words is "six hundred sixty-four million, three hundred forty-three thousand, twenty".