646228 has 24 divisors (see below), whose sum is σ = 1300320. Its totient is φ = 277920.

The previous prime is 646199. The next prime is 646237. The reversal of 646228 is 822646.

646228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×646228² = 835221255968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646196 and 646205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450 + ... + 1222.

It is an arithmetic number, because the mean of its divisors is an integer number (54180).

2⁶⁴⁶²²⁸ is an apocalyptic number.

It is an amenable number.

646228 is an abundant number, since it is smaller than the sum of its proper divisors (654092).

It is a weird number, because it is abundant, but not a pseudoperfect number.

646228 is a wasteful number, since it uses less digits than its factorization.

646228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 805 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 646228 is about 803.8830760751. The cubic root of 646228 is about 86.4560236218.

The spelling of 646228 in words is "six hundred forty-six thousand, two hundred twenty-eight".