646028 has 6 divisors (see below), whose sum is σ = 1130556. Its totient is φ = 323012.

The previous prime is 646027. The next prime is 646039. The reversal of 646028 is 820646.

It is a junction number, because it is equal to n+sod(n) for n = 645988 and 646006.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646028.

It is not an unprimeable number, because it can be changed into a prime (646027) by changing a digit.

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 as a sum of consecutive naturals, namely, 80750 + ... + 80757.

It is an arithmetic number, because the mean of its divisors is an integer number (188426).

2⁶⁴⁶⁰²⁸ is an apocalyptic number.

It is an amenable number.

646028 is a deficient number, since it is larger than the sum of its proper divisors (484528).

646028 is a wasteful number, since it uses less digits than its factorization.

646028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161511 (or 161509 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 646028 is about 803.7586702487. The cubic root of 646028 is about 86.4471036592.

The spelling of 646028 in words is "six hundred forty-six thousand, twenty-eight".