642223646 has 8 divisors (see below), whose sum is σ = 970266360. Its totient is φ = 318801528.

The previous prime is 642223639. The next prime is 642223649. The reversal of 642223646 is 646322246.

642223646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×642223646² = 824902422963066632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642223649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1154801 + ... + 1155356.

It is an arithmetic number, because the mean of its divisors is an integer number (121283295).

Almost surely, 2^642223646 is an apocalyptic number.

642223646 is a deficient number, since it is larger than the sum of its proper divisors (328042714).

642223646 is a wasteful number, since it uses less digits than its factorization.

642223646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310298.

The product of its digits is 82944, while the sum is 35.

The square root of 642223646 is about 25342.1318361341. The cubic root of 642223646 is about 862.7707848505.

The spelling of 642223646 in words is "six hundred forty-two million, two hundred twenty-three thousand, six hundred forty-six".