646328 has 16 divisors (see below), whose sum is σ = 1221480. Its totient is φ = 320608.

The previous prime is 646309. The next prime is 646339. The reversal of 646328 is 823646.

It is a self number, because there is not a number n which added to its sum of digits gives 646328.

It is a congruent number.

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, 1151 + ... + 1617.

2⁶⁴⁶³²⁸ is an apocalyptic number.

It is an amenable number.

646328 is a deficient number, since it is larger than the sum of its proper divisors (575152).

646328 is a wasteful number, since it uses less digits than its factorization.

646328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 642 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 646328 is about 803.9452717692. The cubic root of 646328 is about 86.4604829130.

The spelling of 646328 in words is "six hundred forty-six thousand, three hundred twenty-eight".