643151634 has 16 divisors (see below), whose sum is σ = 1354003680. Its totient is φ = 203100480.

The previous prime is 643151627. The next prime is 643151651. The reversal of 643151634 is 436151346.

643151634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 643151595 and 643151604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2820727 + ... + 2820954.

It is an arithmetic number, because the mean of its divisors is an integer number (84625230).

Almost surely, 2^643151634 is an apocalyptic number.

643151634 is an abundant number, since it is smaller than the sum of its proper divisors (710852046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643151634 is a wasteful number, since it uses less digits than its factorization.

643151634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5641705.

The product of its digits is 25920, while the sum is 33.

The square root of 643151634 is about 25360.4344205694. The cubic root of 643151634 is about 863.1861415142.

The spelling of 643151634 in words is "six hundred forty-three million, one hundred fifty-one thousand, six hundred thirty-four".