643269 has 16 divisors (see below), whose sum is σ = 949824. Its totient is φ = 384000.

The previous prime is 643243. The next prime is 643273. The reversal of 643269 is 962346.

It is not a de Polignac number, because 643269 - 2¹⁵ = 610501 is a prime.

It is a super-2 number, since 2×643269² = 827590012722, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3237 + ... + 3429.

It is an arithmetic number, because the mean of its divisors is an integer number (59364).

2⁶⁴³²⁶⁹ is an apocalyptic number.

It is an amenable number.

643269 is a deficient number, since it is larger than the sum of its proper divisors (306555).

643269 is a wasteful number, since it uses less digits than its factorization.

643269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308.

The product of its digits is 7776, while the sum is 30.

The square root of 643269 is about 802.0405226670. The cubic root of 643269 is about 86.3238644707.

It can be divided in two parts, 64 and 3269, that added together give a palindrome (3333).

The spelling of 643269 in words is "six hundred forty-three thousand, two hundred sixty-nine".