642446168 has 32 divisors (see below), whose sum is σ = 1482569760. Its totient is φ = 254154240.

The previous prime is 642446141. The next prime is 642446177. The reversal of 642446168 is 861644246.

642446168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440513 + ... + 441968.

It is an arithmetic number, because the mean of its divisors is an integer number (46330305).

Almost surely, 2^642446168 is an apocalyptic number.

It is an amenable number.

642446168 is an abundant number, since it is smaller than the sum of its proper divisors (840123592).

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

642446168 is a wasteful number, since it uses less digits than its factorization.

642446168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882507 (or 882503 counting only the distinct ones).

The product of its digits is 221184, while the sum is 41.

The square root of 642446168 is about 25346.5218126669. The cubic root of 642446168 is about 862.8704195664.

The spelling of 642446168 in words is "six hundred forty-two million, four hundred forty-six thousand, one hundred sixty-eight".