680642 has 4 divisors (see below), whose sum is σ = 1020966. Its totient is φ = 340320.

The previous prime is 680633. The next prime is 680651. The reversal of 680642 is 246086.

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

It is an interprime number because it is at equal distance from previous prime (680633) and next prime (680651).

It can be written as a sum of positive squares in only one way, i.e., 519841 + 160801 = 721^2 + 401^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170159 + ... + 170162.

2⁶⁸⁰⁶⁴² is an apocalyptic number.

680642 is a deficient number, since it is larger than the sum of its proper divisors (340324).

680642 is a wasteful number, since it uses less digits than its factorization.

680642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340323.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 680642 is about 825.0103029660. The cubic root of 680642 is about 87.9642589017.

The spelling of 680642 in words is "six hundred eighty thousand, six hundred forty-two".