680816128 has 20 divisors (see below), whose sum is σ = 1360303560. Its totient is φ = 340407808.

The previous prime is 680816047. The next prime is 680816137. The reversal of 680816128 is 821618086.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664348 + ... + 665371.

It is an arithmetic number, because the mean of its divisors is an integer number (68015178).

Almost surely, 2^680816128 is an apocalyptic number.

It is an amenable number.

680816128 is a deficient number, since it is larger than the sum of its proper divisors (679487432).

680816128 is an equidigital number, since it uses as much as digits as its factorization.

680816128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329737 (or 1329721 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 680816128 is about 26092.4534683881. The cubic root of 680816128 is about 879.7175953324.

The spelling of 680816128 in words is "six hundred eighty million, eight hundred sixteen thousand, one hundred twenty-eight".