680638 has 16 divisors (see below), whose sum is σ = 1187424. Its totient is φ = 286560.

The previous prime is 680633. The next prime is 680651. The reversal of 680638 is 836086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456 + ... + 1252.

It is an arithmetic number, because the mean of its divisors is an integer number (74214).

2⁶⁸⁰⁶³⁸ is an apocalyptic number.

680638 is a deficient number, since it is larger than the sum of its proper divisors (506786).

680638 is a wasteful number, since it uses less digits than its factorization.

680638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 680638 is about 825.0078787503. The cubic root of 680638 is about 87.9640865851.

The spelling of 680638 in words is "six hundred eighty thousand, six hundred thirty-eight".