642577168 has 20 divisors (see below), whose sum is σ = 1263577360. Its totient is φ = 316492704.

The previous prime is 642577163. The next prime is 642577181. The reversal of 642577168 is 861775246.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (642577163) by changing a digit.

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, 298638 + ... + 300781.

It is an arithmetic number, because the mean of its divisors is an integer number (63178868).

Almost surely, 2^642577168 is an apocalyptic number.

It is an amenable number.

642577168 is a deficient number, since it is larger than the sum of its proper divisors (621000192).

642577168 is a wasteful number, since it uses less digits than its factorization.

642577168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599494 (or 599488 counting only the distinct ones).

The product of its digits is 564480, while the sum is 46.

The square root of 642577168 is about 25349.1058619431. The cubic root of 642577168 is about 862.9290643465.

The spelling of 642577168 in words is "six hundred forty-two million, five hundred seventy-seven thousand, one hundred sixty-eight".