668984880 has 80 divisors (see below), whose sum is σ = 2077483104. Its totient is φ = 178083840.

The previous prime is 668984879. The next prime is 668984917. The reversal of 668984880 is 88489866.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×668984880² = 895081539337228800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 668984880.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156532 + ... + 160748.

Almost surely, 2^668984880 is an apocalyptic number.

668984880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668984880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1038741552).

668984880 is an abundant number, since it is smaller than the sum of its proper divisors (1408498224).

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

668984880 is a wasteful number, since it uses less digits than its factorization.

668984880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4894 (or 4888 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 57.

The square root of 668984880 is about 25864.7420246172. The cubic root of 668984880 is about 874.5918662589.

The spelling of 668984880 in words is "six hundred sixty-eight million, nine hundred eighty-four thousand, eight hundred eighty".