643612535 has 8 divisors (see below), whose sum is σ = 773321136. Its totient is φ = 514232640.

The previous prime is 643612531. The next prime is 643612561. The reversal of 643612535 is 535216346.

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

It is not a de Polignac number, because 643612535 - 2² = 643612531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643612495 and 643612504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643612531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77846 + ... + 85715.

It is an arithmetic number, because the mean of its divisors is an integer number (96665142).

Almost surely, 2^643612535 is an apocalyptic number.

643612535 is a deficient number, since it is larger than the sum of its proper divisors (129708601).

643612535 is a wasteful number, since it uses less digits than its factorization.

643612535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164353.

The product of its digits is 64800, while the sum is 35.

The square root of 643612535 is about 25369.5198023140. The cubic root of 643612535 is about 863.3922869690.

The spelling of 643612535 in words is "six hundred forty-three million, six hundred twelve thousand, five hundred thirty-five".