642934668 has 24 divisors (see below), whose sum is σ = 1548574720. Its totient is φ = 207398160.

The previous prime is 642934661. The next prime is 642934717. The reversal of 642934668 is 866439246.

It is not an unprimeable number, because it can be changed into a prime (642934661) 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, 863788 + ... + 864531.

Almost surely, 2^642934668 is an apocalyptic number.

It is an amenable number.

642934668 is an abundant number, since it is smaller than the sum of its proper divisors (905640052).

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

642934668 is a wasteful number, since it uses less digits than its factorization.

642934668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728357 (or 1728355 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 48.

The square root of 642934668 is about 25356.1564122010. The cubic root of 642934668 is about 863.0890658542.

The spelling of 642934668 in words is "six hundred forty-two million, nine hundred thirty-four thousand, six hundred sixty-eight".