643403874 has 8 divisors (see below), whose sum is σ = 1286807760. Its totient is φ = 214467956.

The previous prime is 643403861. The next prime is 643403921. The reversal of 643403874 is 478304346.

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

643403874 is an admirable 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, 53616984 + ... + 53616995.

It is an arithmetic number, because the mean of its divisors is an integer number (160850970).

Almost surely, 2^643403874 is an apocalyptic number.

643403874 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.

643403874 is a wasteful number, since it uses less digits than its factorization.

643403874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107233984.

The product of its (nonzero) digits is 193536, while the sum is 39.

The square root of 643403874 is about 25365.4070339902. The cubic root of 643403874 is about 863.2989721454.

The spelling of 643403874 in words is "six hundred forty-three million, four hundred three thousand, eight hundred seventy-four".