642221338 has 8 divisors (see below), whose sum is σ = 1050907680. Its totient is φ = 291918780.

The previous prime is 642221311. The next prime is 642221429. The reversal of 642221338 is 833122246.

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

It is an unprimeable number.

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, 14595918 + ... + 14595961.

It is an arithmetic number, because the mean of its divisors is an integer number (131363460).

Almost surely, 2^642221338 is an apocalyptic number.

642221338 is a deficient number, since it is larger than the sum of its proper divisors (408686342).

642221338 is a wasteful number, since it uses less digits than its factorization.

642221338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29191892.

The product of its digits is 13824, while the sum is 31.

The square root of 642221338 is about 25342.0862992769. The cubic root of 642221338 is about 862.7697513179.

The spelling of 642221338 in words is "six hundred forty-two million, two hundred twenty-one thousand, three hundred thirty-eight".