643914002 has 8 divisors (see below), whose sum is σ = 974418876. Its totient is φ = 319107712.

The previous prime is 643914001. The next prime is 643914017. The reversal of 643914002 is 200419346.

It can be written as a sum of positive squares in 2 ways, for example, as 541074121 + 102839881 = 23261^2 + 10141^2 .

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

It is not an unprimeable number, because it can be changed into a prime (643914001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1424363 + ... + 1424814.

Almost surely, 2^643914002 is an apocalyptic number.

643914002 is a deficient number, since it is larger than the sum of its proper divisors (330504874).

643914002 is a wasteful number, since it uses less digits than its factorization.

643914002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2849292.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 643914002 is about 25375.4606263611. The cubic root of 643914002 is about 863.5270697459.

The spelling of 643914002 in words is "six hundred forty-three million, nine hundred fourteen thousand, two".