680505 has 16 divisors (see below), whose sum is σ = 1244544. Its totient is φ = 311040.

The previous prime is 680503. The next prime is 680507. The reversal of 680505 is 505086.

It is an interprime number because it is at equal distance from previous prime (680503) and next prime (680507).

It is not a de Polignac number, because 680505 - 2¹ = 680503 is a prime.

It is a Curzon number.

680505 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (680503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3136 + ... + 3345.

It is an arithmetic number, because the mean of its divisors is an integer number (77784).

2⁶⁸⁰⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

680505 is a deficient number, since it is larger than the sum of its proper divisors (564039).

680505 is a wasteful number, since it uses less digits than its factorization.

680505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6496.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 680505 is about 824.9272695214. The cubic root of 680505 is about 87.9583566741.

The spelling of 680505 in words is "six hundred eighty thousand, five hundred five".