646596396 has 72 divisors (see below), whose sum is σ = 1680588000. Its totient is φ = 209524224.

The previous prime is 646596389. The next prime is 646596407. The reversal of 646596396 is 693695646.

It is a happy number.

646596396 is a `hidden beast` number, since 6 + 46 + 596 + 3 + 9 + 6 = 666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 214105 + ... + 217103.

It is an arithmetic number, because the mean of its divisors is an integer number (23341500).

Almost surely, 2^646596396 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 646596396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840294000).

646596396 is an abundant number, since it is smaller than the sum of its proper divisors (1033991604).

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

646596396 is a wasteful number, since it uses less digits than its factorization.

646596396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3175 (or 3170 counting only the distinct ones).

The product of its digits is 6298560, while the sum is 54.

The square root of 646596396 is about 25428.2597910278. The cubic root of 646596396 is about 864.7244919858.

The spelling of 646596396 in words is "six hundred forty-six million, five hundred ninety-six thousand, three hundred ninety-six".