8420208668 has 12 divisors (see below), whose sum is σ = 14738111472. Its totient is φ = 4209319680.

The previous prime is 8420208631. The next prime is 8420208677. The reversal of 8420208668 is 8668020248.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171680 + ... + 215207.

It is an arithmetic number, because the mean of its divisors is an integer number (1228175956).

Almost surely, 2^8420208668 is an apocalyptic number.

It is an amenable number.

8420208668 is a deficient number, since it is larger than the sum of its proper divisors (6317902804).

8420208668 is a wasteful number, since it uses less digits than its factorization.

8420208668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392332 (or 392330 counting only the distinct ones).

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

The square root of 8420208668 is about 91761.6949930634. The cubic root of 8420208668 is about 2034.4215681400.

The spelling of 8420208668 in words is "eight billion, four hundred twenty million, two hundred eight thousand, six hundred sixty-eight".