664002340 has 24 divisors (see below), whose sum is σ = 1394963640. Its totient is φ = 265494528.

The previous prime is 664002319. The next prime is 664002349. The reversal of 664002340 is 43200466.

It can be written as a sum of positive squares in 4 ways, for example, as 1763584 + 662238756 = 1328^2 + 25734^2 .

It is not an unprimeable number, because it can be changed into a prime (664002349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61594 + ... + 71566.

It is an arithmetic number, because the mean of its divisors is an integer number (58123485).

Almost surely, 2^664002340 is an apocalyptic number.

It is an amenable number.

664002340 is an abundant number, since it is smaller than the sum of its proper divisors (730961300).

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

664002340 is a wasteful number, since it uses less digits than its factorization.

664002340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13311 (or 13309 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 664002340 is about 25768.2428582160. The cubic root of 664002340 is about 872.4151591136.

The spelling of 664002340 in words is "six hundred sixty-four million, two thousand, three hundred forty".