680661328 has 20 divisors (see below), whose sum is σ = 1328852448. Its totient is φ = 337731680.

The previous prime is 680661323. The next prime is 680661329. The reversal of 680661328 is 823166086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680661323) 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, 160276 + ... + 164467.

Almost surely, 2^680661328 is an apocalyptic number.

It is an amenable number.

680661328 is a deficient number, since it is larger than the sum of its proper divisors (648191120).

680661328 is a wasteful number, since it uses less digits than its factorization.

680661328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324882 (or 324876 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 680661328 is about 26089.4869248132. The cubic root of 680661328 is about 879.6509152599.

The spelling of 680661328 in words is "six hundred eighty million, six hundred sixty-one thousand, three hundred twenty-eight".