680846785 has 4 divisors (see below), whose sum is σ = 817016148. Its totient is φ = 544677424.

The previous prime is 680846743. The next prime is 680846791. The reversal of 680846785 is 587648086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 587648086 = 2 ⋅293824043.

It can be written as a sum of positive squares in 2 ways, for example, as 110019121 + 570827664 = 10489^2 + 23892^2 .

It is a cyclic number.

It is not a de Polignac number, because 680846785 - 2¹⁷ = 680715713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68084674 + ... + 68084683.

It is an arithmetic number, because the mean of its divisors is an integer number (204254037).

Almost surely, 2^680846785 is an apocalyptic number.

It is an amenable number.

680846785 is a deficient number, since it is larger than the sum of its proper divisors (136169363).

680846785 is a wasteful number, since it uses less digits than its factorization.

680846785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136169362.

The product of its (nonzero) digits is 2580480, while the sum is 52.

The square root of 680846785 is about 26093.0409304857. The cubic root of 680846785 is about 879.7307996306.

The spelling of 680846785 in words is "six hundred eighty million, eight hundred forty-six thousand, seven hundred eighty-five".