680686623 has 12 divisors (see below), whose sum is σ = 1014931008. Its totient is φ = 439152480.

The previous prime is 680686597. The next prime is 680686627. The reversal of 680686623 is 326686086.

It is not a de Polignac number, because 680686623 - 2¹³ = 680678431 is a prime.

It is a super-2 number, since 2×680686623² = 926668557462288258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680686627) 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, 1219590 + ... + 1220147.

It is an arithmetic number, because the mean of its divisors is an integer number (84577584).

Almost surely, 2^680686623 is an apocalyptic number.

680686623 is a deficient number, since it is larger than the sum of its proper divisors (334244385).

680686623 is a wasteful number, since it uses less digits than its factorization.

680686623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2439774 (or 2439771 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 680686623 is about 26089.9716941203. The cubic root of 680686623 is about 879.6618117676.

It can be divided in two parts, 68068 and 6623, that added together give a triangular number (74691 = T₃₈₆).

The spelling of 680686623 in words is "six hundred eighty million, six hundred eighty-six thousand, six hundred twenty-three".