643354674 has 8 divisors (see below), whose sum is σ = 1286709360. Its totient is φ = 214451556.

The previous prime is 643354639. The next prime is 643354711. The reversal of 643354674 is 476453346.

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

643354674 is an admirable number.

It is a Curzon number.

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, 53612884 + ... + 53612895.

It is an arithmetic number, because the mean of its divisors is an integer number (160838670).

Almost surely, 2^643354674 is an apocalyptic number.

643354674 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.

643354674 is a wasteful number, since it uses less digits than its factorization.

643354674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107225784.

The product of its digits is 725760, while the sum is 42.

The square root of 643354674 is about 25364.4371906810. The cubic root of 643354674 is about 863.2769665831.

The spelling of 643354674 in words is "six hundred forty-three million, three hundred fifty-four thousand, six hundred seventy-four".