643286 has 8 divisors (see below), whose sum is σ = 1102800. Its totient is φ = 275688.

The previous prime is 643273. The next prime is 643301. The reversal of 643286 is 682346.

643286 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

643286 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, 22961 + ... + 22988.

It is an arithmetic number, because the mean of its divisors is an integer number (137850).

2⁶⁴³²⁸⁶ is an apocalyptic number.

643286 is a deficient number, since it is larger than the sum of its proper divisors (459514).

643286 is a wasteful number, since it uses less digits than its factorization.

643286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45958.

The product of its digits is 6912, while the sum is 29.

The square root of 643286 is about 802.0511205653. The cubic root of 643286 is about 86.3246249057.

Subtracting 643286 from its reverse (682346), we obtain a triangular number (39060 = T₂₇₉).

It can be divided in two parts, 643 and 286, that added together give a palindrome (929).

The spelling of 643286 in words is "six hundred forty-three thousand, two hundred eighty-six".