643674 has 8 divisors (see below), whose sum is σ = 1287360. Its totient is φ = 214556.

The previous prime is 643661. The next prime is 643681. The reversal of 643674 is 476346.

643674 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

643674 is an admirable number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643674.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53634 + ... + 53645.

It is an arithmetic number, because the mean of its divisors is an integer number (160920).

2⁶⁴³⁶⁷⁴ is an apocalyptic number.

643674 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.

643674 is a wasteful number, since it uses less digits than its factorization.

643674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107284.

The product of its digits is 12096, while the sum is 30.

The square root of 643674 is about 802.2929639477. The cubic root of 643674 is about 86.3419770750.

The spelling of 643674 in words is "six hundred forty-three thousand, six hundred seventy-four".