642403535 has 4 divisors (see below), whose sum is σ = 770884248. Its totient is φ = 513922824.

The previous prime is 642403523. The next prime is 642403579. The reversal of 642403535 is 535304246.

642403535 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642403535 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64240349 + ... + 64240358.

It is an arithmetic number, because the mean of its divisors is an integer number (192721062).

Almost surely, 2^642403535 is an apocalyptic number.

642403535 is a deficient number, since it is larger than the sum of its proper divisors (128480713).

642403535 is a wasteful number, since it uses less digits than its factorization.

642403535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128480712.

The product of its (nonzero) digits is 43200, while the sum is 32.

The square root of 642403535 is about 25345.6807957490. The cubic root of 642403535 is about 862.8513323286.

The spelling of 642403535 in words is "six hundred forty-two million, four hundred three thousand, five hundred thirty-five".