680447671 has 4 divisors (see below), whose sum is σ = 682770312. Its totient is φ = 678125032.

The previous prime is 680447639. The next prime is 680447683. The reversal of 680447671 is 176744086.

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

It is a cyclic number.

It is not a de Polignac number, because 680447671 - 2⁵ = 680447639 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 (680447611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1160881 + ... + 1161466.

It is an arithmetic number, because the mean of its divisors is an integer number (170692578).

Almost surely, 2^680447671 is an apocalyptic number.

680447671 is a deficient number, since it is larger than the sum of its proper divisors (2322641).

680447671 is a wasteful number, since it uses less digits than its factorization.

680447671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322640.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 680447671 is about 26085.3919081159. The cubic root of 680447671 is about 879.5588659365.

The spelling of 680447671 in words is "six hundred eighty million, four hundred forty-seven thousand, six hundred seventy-one".