643255 has 8 divisors (see below), whose sum is σ = 778752. Its totient is φ = 510048.

The previous prime is 643243. The next prime is 643273. The reversal of 643255 is 552346.

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

It is a cyclic number.

It is not a de Polignac number, because 643255 - 2¹⁹ = 118967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (97344).

2⁶⁴³²⁵⁵ is an apocalyptic number.

643255 is a deficient number, since it is larger than the sum of its proper divisors (135497).

643255 is a wasteful number, since it uses less digits than its factorization.

643255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145.

The product of its digits is 3600, while the sum is 25.

The square root of 643255 is about 802.0317948810. The cubic root of 643255 is about 86.3232382201.

Subtracting from 643255 its reverse (552346), we obtain a palindrome (90909).

It can be divided in two parts, 643 and 255, that added together give a palindrome (898).

The spelling of 643255 in words is "six hundred forty-three thousand, two hundred fifty-five".