664405602 has 96 divisors (see below), whose sum is σ = 1612872000. Its totient is φ = 181706112.

The previous prime is 664405601. The next prime is 664405649. The reversal of 664405602 is 206504466.

It is not an unprimeable number, because it can be changed into a prime (664405601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1270113 + ... + 1270635.

It is an arithmetic number, because the mean of its divisors is an integer number (16800750).

Almost surely, 2^664405602 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664405602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806436000).

664405602 is an abundant number, since it is smaller than the sum of its proper divisors (948466398).

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

664405602 is a wasteful number, since it uses less digits than its factorization.

664405602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 664405602 is about 25776.0664570838. The cubic root of 664405602 is about 872.5917351405.

The spelling of 664405602 in words is "six hundred sixty-four million, four hundred five thousand, six hundred two".