642135506 has 8 divisors (see below), whose sum is σ = 968246784. Its totient is φ = 319386580.

The previous prime is 642135499. The next prime is 642135523. The reversal of 642135506 is 605531246.

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

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, 840110 + ... + 840873.

It is an arithmetic number, because the mean of its divisors is an integer number (121030848).

Almost surely, 2^642135506 is an apocalyptic number.

642135506 is a deficient number, since it is larger than the sum of its proper divisors (326111278).

642135506 is a wasteful number, since it uses less digits than its factorization.

642135506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681176.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 642135506 is about 25340.3927751722. The cubic root of 642135506 is about 862.7313136079.

The spelling of 642135506 in words is "six hundred forty-two million, one hundred thirty-five thousand, five hundred six".