643719034 has 8 divisors (see below), whose sum is σ = 1103518368. Its totient is φ = 275879580.

The previous prime is 643718989. The next prime is 643719047. The reversal of 643719034 is 430917346.

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

It is a junction number, because it is equal to n+sod(n) for n = 643718984 and 643719002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22989952 + ... + 22989979.

It is an arithmetic number, because the mean of its divisors is an integer number (137939796).

Almost surely, 2^643719034 is an apocalyptic number.

643719034 is a deficient number, since it is larger than the sum of its proper divisors (459799334).

643719034 is a wasteful number, since it uses less digits than its factorization.

643719034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45979940.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 643719034 is about 25371.6186712634. The cubic root of 643719034 is about 863.4399063771.

The spelling of 643719034 in words is "six hundred forty-three million, seven hundred nineteen thousand, thirty-four".