646920352 has 96 divisors (see below), whose sum is σ = 1408836240. Its totient is φ = 290611200.

The previous prime is 646920331. The next prime is 646920353. The reversal of 646920352 is 253029646.

It can be written as a sum of positive squares in 8 ways, for example, as 432473616 + 214446736 = 20796^2 + 14644^2 .

It is not an unprimeable number, because it can be changed into a prime (646920353) 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 15 ways as a sum of consecutive naturals, for example, 3739338 + ... + 3739510.

Almost surely, 2^646920352 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 646920352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704418120).

646920352 is an abundant number, since it is smaller than the sum of its proper divisors (761915888).

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

646920352 is a wasteful number, since it uses less digits than its factorization.

646920352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 646920352 is about 25434.6289927728. The cubic root of 646920352 is about 864.8688818600.

Adding to 646920352 its reverse (253029646), we get a palindrome (899949998).

The spelling of 646920352 in words is "six hundred forty-six million, nine hundred twenty thousand, three hundred fifty-two".