642268768 has 12 divisors (see below), whose sum is σ = 1264466700. Its totient is φ = 321134368.

The previous prime is 642268747. The next prime is 642268777. The reversal of 642268768 is 867862246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10035418 + ... + 10035481.

It is an arithmetic number, because the mean of its divisors is an integer number (105372225).

Almost surely, 2^642268768 is an apocalyptic number.

It is an amenable number.

642268768 is a deficient number, since it is larger than the sum of its proper divisors (622197932).

642268768 is a wasteful number, since it uses less digits than its factorization.

642268768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20070909 (or 20070901 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 49.

The square root of 642268768 is about 25343.0220770925. The cubic root of 642268768 is about 862.7909901855.

The spelling of 642268768 in words is "six hundred forty-two million, two hundred sixty-eight thousand, seven hundred sixty-eight".