642704222 has 8 divisors (see below), whose sum is σ = 1014796200. Its totient is φ = 304438824.

The previous prime is 642704219. The next prime is 642704269. The reversal of 642704222 is 222407246.

It is a happy number.

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

It is a super-4 number, since 4×642704222⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8456597 + ... + 8456672.

It is an arithmetic number, because the mean of its divisors is an integer number (126849525).

Almost surely, 2^642704222 is an apocalyptic number.

642704222 is a deficient number, since it is larger than the sum of its proper divisors (372091978).

642704222 is a wasteful number, since it uses less digits than its factorization.

642704222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16913290.

The product of its (nonzero) digits is 10752, while the sum is 29.

The square root of 642704222 is about 25351.6118225252. The cubic root of 642704222 is about 862.9859350071.

The spelling of 642704222 in words is "six hundred forty-two million, seven hundred four thousand, two hundred twenty-two".