646288 has 20 divisors (see below), whose sum is σ = 1293568. Its totient is φ = 312480.

The previous prime is 646273. The next prime is 646291. The reversal of 646288 is 882646.

646288 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156 + ... + 1147.

2⁶⁴⁶²⁸⁸ is an apocalyptic number.

It is an amenable number.

646288 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

646288 is a wasteful number, since it uses less digits than its factorization.

646288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342 (or 1336 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 646288 is about 803.9203940690. The cubic root of 646288 is about 86.4586992517.

The spelling of 646288 in words is "six hundred forty-six thousand, two hundred eighty-eight".