680818 has 4 divisors (see below), whose sum is σ = 1021230. Its totient is φ = 340408.

The previous prime is 680809. The next prime is 680831. The reversal of 680818 is 818086.

680818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 818086 = 2 ⋅409043.

It can be written as a sum of positive squares in only one way, i.e., 471969 + 208849 = 687^2 + 457^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 680818.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170203 + ... + 170206.

2⁶⁸⁰⁸¹⁸ is an apocalyptic number.

680818 is a deficient number, since it is larger than the sum of its proper divisors (340412).

680818 is a wasteful number, since it uses less digits than its factorization.

680818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340411.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 680818 is about 825.1169614061. The cubic root of 680818 is about 87.9718401634.

The spelling of 680818 in words is "six hundred eighty thousand, eight hundred eighteen".