642388506 has 8 divisors (see below), whose sum is σ = 1284777024. Its totient is φ = 214129500.

The previous prime is 642388501. The next prime is 642388529. The reversal of 642388506 is 605883246.

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

642388506 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (642388501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53532370 + ... + 53532381.

It is an arithmetic number, because the mean of its divisors is an integer number (160597128).

Almost surely, 2^642388506 is an apocalyptic number.

642388506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642388506 is a wasteful number, since it uses less digits than its factorization.

642388506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107064756.

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 642388506 is about 25345.3843135195. The cubic root of 642388506 is about 862.8446034875.

The spelling of 642388506 in words is "six hundred forty-two million, three hundred eighty-eight thousand, five hundred six".