668083408 has 40 divisors (see below), whose sum is σ = 1387946880. Its totient is φ = 310402560.

The previous prime is 668083399. The next prime is 668083421. The reversal of 668083408 is 804380866.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5943 + ... + 37033.

It is an arithmetic number, because the mean of its divisors is an integer number (34698672).

Almost surely, 2^668083408 is an apocalyptic number.

668083408 is a gapful number since it is divisible by the number (68) 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 668083408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (693973440).

668083408 is an abundant number, since it is smaller than the sum of its proper divisors (719863472).

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

668083408 is a wasteful number, since it uses less digits than its factorization.

668083408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31195 (or 31189 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 668083408 is about 25847.3094924791. The cubic root of 668083408 is about 874.1988456762.

The spelling of 668083408 in words is "six hundred sixty-eight million, eighty-three thousand, four hundred eight".