643288 has 16 divisors (see below), whose sum is σ = 1215360. Its totient is φ = 319200.

The previous prime is 643273. The next prime is 643301. The reversal of 643288 is 882346.

It is a happy number.

It is a congruent 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, 1318 + ... + 1738.

It is an arithmetic number, because the mean of its divisors is an integer number (75960).

2⁶⁴³²⁸⁸ is an apocalyptic number.

It is an amenable number.

643288 is a deficient number, since it is larger than the sum of its proper divisors (572072).

643288 is a wasteful number, since it uses less digits than its factorization.

643288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 614 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 643288 is about 802.0523673676. The cubic root of 643288 is about 86.3247143678.

The spelling of 643288 in words is "six hundred forty-three thousand, two hundred eighty-eight".