642670168 has 32 divisors (see below), whose sum is σ = 1414375200. Its totient is φ = 267985152.

The previous prime is 642670111. The next prime is 642670169. The reversal of 642670168 is 861076246.

642670168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 642670168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642670169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153013 + ... + 157156.

It is an arithmetic number, because the mean of its divisors is an integer number (44199225).

Almost surely, 2^642670168 is an apocalyptic number.

It is an amenable number.

642670168 is an abundant number, since it is smaller than the sum of its proper divisors (771705032).

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

642670168 is a wasteful number, since it uses less digits than its factorization.

642670168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310219 (or 310215 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 642670168 is about 25350.9401798040. The cubic root of 642670168 is about 862.9706928261.

The spelling of 642670168 in words is "six hundred forty-two million, six hundred seventy thousand, one hundred sixty-eight".