680247221 has 8 divisors (see below), whose sum is σ = 690561624. Its totient is φ = 670003200.

The previous prime is 680247199. The next prime is 680247233. The reversal of 680247221 is 122742086.

It can be written as a sum of positive squares in 4 ways, for example, as 42432196 + 637815025 = 6514^2 + 25255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 680247221 - 2⁶ = 680247157 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 (680247251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2045 + ... + 36941.

It is an arithmetic number, because the mean of its divisors is an integer number (86320203).

Almost surely, 2^680247221 is an apocalyptic number.

It is an amenable number.

680247221 is a deficient number, since it is larger than the sum of its proper divisors (10314403).

680247221 is a wasteful number, since it uses less digits than its factorization.

680247221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35191.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 680247221 is about 26081.5494363353. The cubic root of 680247221 is about 879.4724890323.

The spelling of 680247221 in words is "six hundred eighty million, two hundred forty-seven thousand, two hundred twenty-one".