680647728 has 20 divisors (see below), whose sum is σ = 1758340088. Its totient is φ = 226882560.

The previous prime is 680647663. The next prime is 680647729. The reversal of 680647728 is 827746086.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 14180161 = 680647728 / (6 + 8 + 0 + 6 + 4 + 7 + 7 + 2 + 8).

It is not an unprimeable number, because it can be changed into a prime (680647729) 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, 7090033 + ... + 7090128.

Almost surely, 2^680647728 is an apocalyptic number.

It is an amenable number.

680647728 is an abundant number, since it is smaller than the sum of its proper divisors (1077692360).

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

680647728 is a wasteful number, since it uses less digits than its factorization.

680647728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14180172 (or 14180166 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 48.

The square root of 680647728 is about 26089.2262821265. The cubic root of 680647728 is about 879.6450565792.

The spelling of 680647728 in words is "six hundred eighty million, six hundred forty-seven thousand, seven hundred twenty-eight".