680669 has 4 divisors (see below), whose sum is σ = 742560. Its totient is φ = 618780.

The previous prime is 680657. The next prime is 680681. The reversal of 680669 is 966086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (680657) and next prime (680681).

It is a cyclic number.

It is not a de Polignac number, because 680669 - 2¹² = 676573 is a prime.

It is a super-2 number, since 2×680669² = 926620575122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680569) 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 3 ways as a sum of consecutive naturals, for example, 30929 + ... + 30950.

It is an arithmetic number, because the mean of its divisors is an integer number (185640).

2⁶⁸⁰⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

680669 is a deficient number, since it is larger than the sum of its proper divisors (61891).

680669 is a wasteful number, since it uses less digits than its factorization.

680669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61890.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 680669 is about 825.0266662357. The cubic root of 680669 is about 87.9654220211.

The spelling of 680669 in words is "six hundred eighty thousand, six hundred sixty-nine".