680851305 has 64 divisors (see below), whose sum is σ = 1236695040. Its totient is φ = 355320000.

The previous prime is 680851291. The next prime is 680851307. The reversal of 680851305 is 503158086.

680851305 = 482² + 483² + ... + 1291².

It is not a de Polignac number, because 680851305 - 2⁷ = 680851177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 680851305.

It is not an unprimeable number, because it can be changed into a prime (680851307) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2405694 + ... + 2405976.

It is an arithmetic number, because the mean of its divisors is an integer number (19323360).

Almost surely, 2^680851305 is an apocalyptic number.

It is an amenable number.

680851305 is a deficient number, since it is larger than the sum of its proper divisors (555843735).

680851305 is a wasteful number, since it uses less digits than its factorization.

680851305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 613 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 680851305 is about 26093.1275434740. The cubic root of 680851305 is about 879.7327464095.

The spelling of 680851305 in words is "six hundred eighty million, eight hundred fifty-one thousand, three hundred five".