643468 has 30 divisors (see below), whose sum is σ = 1333276. Its totient is φ = 271656.

The previous prime is 643463. The next prime is 643469. The reversal of 643468 is 864346.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (643463) by changing a digit.

643468 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 9 ways as a sum of consecutive naturals, for example, 9571 + ... + 9637.

2⁶⁴³⁴⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (666638).

643468 is an abundant number, since it is smaller than the sum of its proper divisors (689808).

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

643468 is an equidigital number, since it uses as much as digits as its factorization.

With its predecessor (643467) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (99).

643468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 76 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 643468 is about 802.1645716435. The cubic root of 643468 is about 86.3327651939.

It can be divided in two parts, 643 and 468, that added together give a palindrome (1111).

The spelling of 643468 in words is "six hundred forty-three thousand, four hundred sixty-eight".