646321352 has 16 divisors (see below), whose sum is σ = 1231719900. Its totient is φ = 317862720.

The previous prime is 646321349. The next prime is 646321363. The reversal of 646321352 is 253123646.

It can be written as a sum of positive squares in 2 ways, for example, as 463368676 + 182952676 = 21526^2 + 13526^2 .

It is a super-2 number, since 2×646321352² = 835462580102215808, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661727 + ... + 662702.

Almost surely, 2^646321352 is an apocalyptic number.

It is an amenable number.

646321352 is a deficient number, since it is larger than the sum of its proper divisors (585398548).

646321352 is a wasteful number, since it uses less digits than its factorization.

646321352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324496 (or 1324492 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 646321352 is about 25422.8509809581. The cubic root of 646321352 is about 864.6018647356.

Adding to 646321352 its reverse (253123646), we get a palindrome (899444998).

The spelling of 646321352 in words is "six hundred forty-six million, three hundred twenty-one thousand, three hundred fifty-two".