680649071 has 4 divisors (see below), whose sum is σ = 681420792. Its totient is φ = 679877352.

The previous prime is 680649061. The next prime is 680649121. The reversal of 680649071 is 170946086.

680649071 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 is a cyclic number.

It is not a de Polignac number, because 680649071 - 2¹⁰ = 680648047 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 (680649001) 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, 384536 + ... + 386301.

It is an arithmetic number, because the mean of its divisors is an integer number (170355198).

Almost surely, 2^680649071 is an apocalyptic number.

680649071 is a deficient number, since it is larger than the sum of its proper divisors (771721).

680649071 is an equidigital number, since it uses as much as digits as its factorization.

680649071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771720.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 680649071 is about 26089.2520207077. The cubic root of 680649071 is about 879.6456351274.

The spelling of 680649071 in words is "six hundred eighty million, six hundred forty-nine thousand, seventy-one".