680866809 has 12 divisors (see below), whose sum is σ = 1056038544. Its totient is φ = 389066664.

The previous prime is 680866807. The next prime is 680866817. The reversal of 680866809 is 908668086.

It is not a de Polignac number, because 680866809 - 2¹ = 680866807 is a prime.

It is a super-2 number, since 2×680866809² = 927159223195684962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (680866807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2315727 + ... + 2316020.

It is an arithmetic number, because the mean of its divisors is an integer number (88003212).

Almost surely, 2^680866809 is an apocalyptic number.

It is an amenable number.

680866809 is a deficient number, since it is larger than the sum of its proper divisors (375171735).

680866809 is a wasteful number, since it uses less digits than its factorization.

680866809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4631764 (or 4631757 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 51.

The square root of 680866809 is about 26093.4246315044. The cubic root of 680866809 is about 879.7394239678.

The spelling of 680866809 in words is "six hundred eighty million, eight hundred sixty-six thousand, eight hundred nine".