668084408 has 16 divisors (see below), whose sum is σ = 1254529680. Its totient is φ = 333543168.

The previous prime is 668084401. The next prime is 668084423. The reversal of 668084408 is 804480866.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668084401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56660 + ... + 67427.

It is an arithmetic number, because the mean of its divisors is an integer number (78408105).

Almost surely, 2^668084408 is an apocalyptic number.

It is an amenable number.

668084408 is a deficient number, since it is larger than the sum of its proper divisors (586445272).

668084408 is a wasteful number, since it uses less digits than its factorization.

668084408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124766 (or 124762 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 44.

The square root of 668084408 is about 25847.3288368450. The cubic root of 668084408 is about 874.1992818485.

The spelling of 668084408 in words is "six hundred sixty-eight million, eighty-four thousand, four hundred eight".