664040356 has 18 divisors (see below), whose sum is σ = 1351796838. Its totient is φ = 284588640.

The previous prime is 664040287. The next prime is 664040389. The reversal of 664040356 is 653040466.

664040356 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 only one way, i.e., 659976100 + 4064256 = 25690^2 + 2016^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1693785 + ... + 1694176.

Almost surely, 2^664040356 is an apocalyptic number.

It is an amenable number.

664040356 is an abundant number, since it is smaller than the sum of its proper divisors (687756482).

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

664040356 is a wasteful number, since it uses less digits than its factorization.

664040356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387979 (or 3387970 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 664040356 is about 25768.9804998180. The cubic root of 664040356 is about 872.4318082024.

The spelling of 664040356 in words is "six hundred sixty-four million, forty thousand, three hundred fifty-six".