680323728 has 160 divisors (see below), whose sum is σ = 2150179840. Its totient is φ = 181025280.

The previous prime is 680323727. The next prime is 680323729. The reversal of 680323728 is 827323086.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (680323727) and next prime (680323729).

It is not an unprimeable number, because it can be changed into a prime (680323723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 388551 + ... + 390297.

It is an arithmetic number, because the mean of its divisors is an integer number (13438624).

Almost surely, 2^680323728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 680323728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1075089920).

680323728 is an abundant number, since it is smaller than the sum of its proper divisors (1469856112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

680323728 is a wasteful number, since it uses less digits than its factorization.

680323728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845 (or 1839 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 680323728 is about 26083.0160832677. The cubic root of 680323728 is about 879.5054590453.

The spelling of 680323728 in words is "six hundred eighty million, three hundred twenty-three thousand, seven hundred twenty-eight".