643848 has 32 divisors (see below), whose sum is σ = 1629600. Its totient is φ = 211968.

The previous prime is 643847. The next prime is 643849. The reversal of 643848 is 848346.

It is an interprime number because it is at equal distance from previous prime (643847) and next prime (643849).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (643847) 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, 3240 + ... + 3432.

It is an arithmetic number, because the mean of its divisors is an integer number (50925).

2⁶⁴³⁸⁴⁸ is an apocalyptic number.

It is an amenable number.

643848 is an abundant number, since it is smaller than the sum of its proper divisors (985752).

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

643848 is a wasteful number, since it uses less digits than its factorization.

643848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 337 counting only the distinct ones).

The product of its digits is 18432, while the sum is 33.

The square root of 643848 is about 802.4013958113. The cubic root of 643848 is about 86.3497564532.

The spelling of 643848 in words is "six hundred forty-three thousand, eight hundred forty-eight".