664246420 has 12 divisors (see below), whose sum is σ = 1394917524. Its totient is φ = 265698560.

The previous prime is 664246399. The next prime is 664246469. The reversal of 664246420 is 24642466.

664246420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 387223684 + 277022736 = 19678^2 + 16644^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16606141 + ... + 16606180.

It is an arithmetic number, because the mean of its divisors is an integer number (116243127).

Almost surely, 2^664246420 is an apocalyptic number.

It is an amenable number.

664246420 is an abundant number, since it is smaller than the sum of its proper divisors (730671104).

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

664246420 is a wasteful number, since it uses less digits than its factorization.

664246420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33212330 (or 33212328 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 664246420 is about 25772.9784852275. The cubic root of 664246420 is about 872.5220427761.

Adding to 664246420 its reverse (24642466), we get a palindrome (688888886).

The spelling of 664246420 in words is "six hundred sixty-four million, two hundred forty-six thousand, four hundred twenty".