680635 has 8 divisors (see below), whose sum is σ = 822096. Its totient is φ = 540960.

The previous prime is 680633. The next prime is 680651. The reversal of 680635 is 536086.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 680635 - 2¹ = 680633 is a prime.

It is a Duffinian 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, 640 + ... + 1330.

It is an arithmetic number, because the mean of its divisors is an integer number (102762).

2⁶⁸⁰⁶³⁵ is an apocalyptic number.

680635 is a deficient number, since it is larger than the sum of its proper divisors (141461).

680635 is a wasteful number, since it uses less digits than its factorization.

680635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 680635 is about 825.0060605838. The cubic root of 680635 is about 87.9639573473.

The spelling of 680635 in words is "six hundred eighty thousand, six hundred thirty-five".