646208 has 28 divisors (see below), whose sum is σ = 1341120. Its totient is φ = 308352.

The previous prime is 646199. The next prime is 646237. The reversal of 646208 is 802646.

It is an unprimeable number.

646208 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1253 + ... + 1691.

2⁶⁴⁶²⁰⁸ 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 646208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (670560).

646208 is an abundant number, since it is smaller than the sum of its proper divisors (694912).

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

646208 is a wasteful number, since it uses less digits than its factorization.

646208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 464 counting only the distinct ones).

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

The square root of 646208 is about 803.8706363589. The cubic root of 646208 is about 86.4551317083.

The spelling of 646208 in words is "six hundred forty-six thousand, two hundred eight".