668767876 has 72 divisors (see below), whose sum is σ = 1389950016. Its totient is φ = 280687680.

The previous prime is 668767873. The next prime is 668767889. The reversal of 668767876 is 678767866.

668767876 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (668767873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3169411 + ... + 3169621.

Almost surely, 2^668767876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668767876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694975008).

668767876 is an abundant number, since it is smaller than the sum of its proper divisors (721182140).

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

668767876 is a wasteful number, since it uses less digits than its factorization.

668767876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 480 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 61.

The square root of 668767876 is about 25860.5467072914. The cubic root of 668767876 is about 874.4972899020.

The spelling of 668767876 in words is "six hundred sixty-eight million, seven hundred sixty-seven thousand, eight hundred seventy-six".