642622242 has 8 divisors (see below), whose sum is σ = 1285244496. Its totient is φ = 214207412.

The previous prime is 642622241. The next prime is 642622247. The reversal of 642622242 is 242226246.

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

642622242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (642622241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53551848 + ... + 53551859.

It is an arithmetic number, because the mean of its divisors is an integer number (160655562).

Almost surely, 2^642622242 is an apocalyptic number.

642622242 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.

642622242 is a wasteful number, since it uses less digits than its factorization.

642622242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107103712.

The product of its digits is 18432, while the sum is 30.

The square root of 642622242 is about 25349.9949112421. The cubic root of 642622242 is about 862.9492407845.

Adding to 642622242 its reverse (242226246), we get a palindrome (884848488).

The spelling of 642622242 in words is "six hundred forty-two million, six hundred twenty-two thousand, two hundred forty-two".