668880860 has 24 divisors (see below), whose sum is σ = 1427679456. Its totient is φ = 263165760.

The previous prime is 668880841. The next prime is 668880887. The reversal of 668880860 is 68088866.

It is a junction number, because it is equal to n+sod(n) for n = 668880799 and 668880808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272912 + ... + 275351.

It is an arithmetic number, because the mean of its divisors is an integer number (59486644).

Almost surely, 2^668880860 is an apocalyptic number.

It is an amenable number.

668880860 is an abundant number, since it is smaller than the sum of its proper divisors (758798596).

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

668880860 is a wasteful number, since it uses less digits than its factorization.

668880860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548333 (or 548331 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 50.

The square root of 668880860 is about 25862.7311009491. The cubic root of 668880860 is about 874.5465340129.

The spelling of 668880860 in words is "six hundred sixty-eight million, eight hundred eighty thousand, eight hundred sixty".