680745773 has 4 divisors (see below), whose sum is σ = 720789660. Its totient is φ = 640701888.

The previous prime is 680745761. The next prime is 680745803. The reversal of 680745773 is 377547086.

680745773 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 307406089 + 373339684 = 17533^2 + 19322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680745773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680745733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20021918 + ... + 20021951.

It is an arithmetic number, because the mean of its divisors is an integer number (180197415).

Almost surely, 2^680745773 is an apocalyptic number.

It is an amenable number.

680745773 is a deficient number, since it is larger than the sum of its proper divisors (40043887).

680745773 is a wasteful number, since it uses less digits than its factorization.

680745773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40043886.

The product of its (nonzero) digits is 987840, while the sum is 47.

The square root of 680745773 is about 26091.1052468078. The cubic root of 680745773 is about 879.6872911817.

The spelling of 680745773 in words is "six hundred eighty million, seven hundred forty-five thousand, seven hundred seventy-three".