668407488 has 112 divisors (see below), whose sum is σ = 2031577344. Its totient is φ = 189987840.

The previous prime is 668407469. The next prime is 668407499. The reversal of 668407488 is 884704866.

668407488 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 668407488.

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, 282406 + ... + 284762.

Almost surely, 2^668407488 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 668407488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1015788672).

668407488 is an abundant number, since it is smaller than the sum of its proper divisors (1363169856).

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

668407488 is a wasteful number, since it uses less digits than its factorization.

668407488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590 (or 2580 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 51.

The square root of 668407488 is about 25853.5778568460. The cubic root of 668407488 is about 874.3401776120.

It can be divided in two parts, 668 and 407488, that added together give a triangular number (408156 = T₉₀₃).

The spelling of 668407488 in words is "six hundred sixty-eight million, four hundred seven thousand, four hundred eighty-eight".