680863989 has 24 divisors (see below), whose sum is σ = 985195872. Its totient is φ = 418067520.

The previous prime is 680863951. The next prime is 680864011. The reversal of 680863989 is 989368086.

It is not a de Polignac number, because 680863989 - 2¹⁷ = 680732917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680863289) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281194 + ... + 283604.

It is an arithmetic number, because the mean of its divisors is an integer number (41049828).

Almost surely, 2^680863989 is an apocalyptic number.

It is an amenable number.

680863989 is a deficient number, since it is larger than the sum of its proper divisors (304331883).

680863989 is a wasteful number, since it uses less digits than its factorization.

680863989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997 (or 2984 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 57.

The square root of 680863989 is about 26093.3705948465. The cubic root of 680863989 is about 879.7382094040.

The spelling of 680863989 in words is "six hundred eighty million, eight hundred sixty-three thousand, nine hundred eighty-nine".