643414136 has 16 divisors (see below), whose sum is σ = 1212655200. Its totient is φ = 320039424.

The previous prime is 643414129. The next prime is 643414139. The reversal of 643414136 is 631414346.

643414136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643414139) 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, 206816 + ... + 209903.

It is an arithmetic number, because the mean of its divisors is an integer number (75790950).

Almost surely, 2^643414136 is an apocalyptic number.

It is an amenable number.

643414136 is a deficient number, since it is larger than the sum of its proper divisors (569241064).

643414136 is a wasteful number, since it uses less digits than its factorization.

643414136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416918 (or 416914 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

The square root of 643414136 is about 25365.6093165530. The cubic root of 643414136 is about 863.3035618633.

The spelling of 643414136 in words is "six hundred forty-three million, four hundred fourteen thousand, one hundred thirty-six".