643612136 has 16 divisors (see below), whose sum is σ = 1208659200. Its totient is φ = 321303024.

The previous prime is 643612103. The next prime is 643612153. The reversal of 643612136 is 631216346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57416 + ... + 67703.

It is an arithmetic number, because the mean of its divisors is an integer number (75541200).

Almost surely, 2^643612136 is an apocalyptic number.

It is an amenable number.

643612136 is a deficient number, since it is larger than the sum of its proper divisors (565047064).

643612136 is a wasteful number, since it uses less digits than its factorization.

643612136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125768 (or 125764 counting only the distinct ones).

The product of its digits is 15552, while the sum is 32.

The square root of 643612136 is about 25369.5119385454. The cubic root of 643612136 is about 863.3921085523.

The spelling of 643612136 in words is "six hundred forty-three million, six hundred twelve thousand, one hundred thirty-six".