680648 has 8 divisors (see below), whose sum is σ = 1276230. Its totient is φ = 340320.

The previous prime is 680633. The next prime is 680651. The reversal of 680648 is 846086.

It can be written as a sum of positive squares in only one way, i.e., 386884 + 293764 = 622^2 + 542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680648.

It is an unprimeable number.

680648 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42533 + ... + 42548.

2⁶⁸⁰⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

680648 is a deficient number, since it is larger than the sum of its proper divisors (595582).

680648 is a wasteful number, since it uses less digits than its factorization.

680648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85087 (or 85083 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 680648 is about 825.0139392762. The cubic root of 680648 is about 87.9645173754.

The spelling of 680648 in words is "six hundred eighty thousand, six hundred forty-eight".