668481768 has 64 divisors (see below), whose sum is σ = 1916812800. Its totient is φ = 215637120.

The previous prime is 668481763. The next prime is 668481787. The reversal of 668481768 is 867184866.

668481768 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (668481761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43221 + ... + 56612.

It is an arithmetic number, because the mean of its divisors is an integer number (29950200).

Almost surely, 2^668481768 is an apocalyptic number.

It is an amenable number.

668481768 is an abundant number, since it is smaller than the sum of its proper divisors (1248331032).

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

668481768 is a wasteful number, since it uses less digits than its factorization.

668481768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99879 (or 99869 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 668481768 is about 25855.0143685901. The cubic root of 668481768 is about 874.3725648328.

The spelling of 668481768 in words is "six hundred sixty-eight million, four hundred eighty-one thousand, seven hundred sixty-eight".