8720668 has 12 divisors (see below), whose sum is σ = 16648632. Its totient is φ = 3963920.

The previous prime is 8720629. The next prime is 8720671. The reversal of 8720668 is 8660278.

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, 99055 + ... + 99142.

It is an arithmetic number, because the mean of its divisors is an integer number (1387386).

Almost surely, 2^8720668 is an apocalyptic number.

It is an amenable number.

8720668 is a deficient number, since it is larger than the sum of its proper divisors (7927964).

8720668 is a wasteful number, since it uses less digits than its factorization.

8720668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198212 (or 198210 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 8720668 is about 2953.0777165527. The cubic root of 8720668 is about 205.8337490453.

The spelling of 8720668 in words is "eight million, seven hundred twenty thousand, six hundred sixty-eight".