680388709 has 16 divisors (see below), whose sum is σ = 913530240. Its totient is φ = 489389760.

The previous prime is 680388703. The next prime is 680388721. The reversal of 680388709 is 907883086.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 680388709 - 2⁵ = 680388677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680388703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338854 + ... + 340855.

It is an arithmetic number, because the mean of its divisors is an integer number (57095640).

Almost surely, 2^680388709 is an apocalyptic number.

It is an amenable number.

680388709 is a deficient number, since it is larger than the sum of its proper divisors (233141531).

680388709 is a wasteful number, since it uses less digits than its factorization.

680388709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679740.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 680388709 is about 26084.2617108478. The cubic root of 680388709 is about 879.5334600897.

The spelling of 680388709 in words is "six hundred eighty million, three hundred eighty-eight thousand, seven hundred nine".