643263 has 8 divisors (see below), whose sum is σ = 908208. Its totient is φ = 403584.

The previous prime is 643243. The next prime is 643273. The reversal of 643263 is 362346.

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

It is not a de Polignac number, because 643263 - 2⁵ = 643231 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

643263 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6256 + ... + 6357.

It is an arithmetic number, because the mean of its divisors is an integer number (113526).

2⁶⁴³²⁶³ is an apocalyptic number.

643263 is a deficient number, since it is larger than the sum of its proper divisors (264945).

643263 is a wasteful number, since it uses less digits than its factorization.

643263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12633.

The product of its digits is 2592, while the sum is 24.

The square root of 643263 is about 802.0367821989. The cubic root of 643263 is about 86.3235960787.

The spelling of 643263 in words is "six hundred forty-three thousand, two hundred sixty-three".