680465 has 4 divisors (see below), whose sum is σ = 816564. Its totient is φ = 544368.

The previous prime is 680453. The next prime is 680489. The reversal of 680465 is 564086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 201601 + 478864 = 449^2 + 692^2 .

It is a cyclic number.

It is not a de Polignac number, because 680465 - 2⁶ = 680401 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68042 + ... + 68051.

It is an arithmetic number, because the mean of its divisors is an integer number (204141).

2⁶⁸⁰⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

680465 is a deficient number, since it is larger than the sum of its proper divisors (136099).

680465 is a wasteful number, since it uses less digits than its factorization.

680465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136098.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 680465 is about 824.9030246035. The cubic root of 680465 is about 87.9566332465.

The spelling of 680465 in words is "six hundred eighty thousand, four hundred sixty-five".