643336 has 32 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 298816.

The previous prime is 643303. The next prime is 643369. The reversal of 643336 is 633346.

643336 = T₁₁₉ + T₁₂₀ + ... + T₁₇₆.

It is an interprime number because it is at equal distance from previous prime (643303) and next prime (643369).

Together with 652664 it forms an amicable pair .

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 643336.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10875 + ... + 10933.

It is an arithmetic number, because the mean of its divisors is an integer number (40500).

2⁶⁴³³³⁶ is an apocalyptic number.

It is an amenable number.

643336 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643336 is a wasteful number, since it uses less digits than its factorization.

643336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 137 counting only the distinct ones).

The product of its digits is 3888, while the sum is 25.

The square root of 643336 is about 802.0822900426. The cubic root of 643336 is about 86.3268614016.

It can be divided in two parts, 643 and 336, that added together give a palindrome (979).

The spelling of 643336 in words is "six hundred forty-three thousand, three hundred thirty-six".