681220 has 12 divisors (see below), whose sum is σ = 1430604. Its totient is φ = 272480.

The previous prime is 681179. The next prime is 681221. The reversal of 681220 is 22186.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 69696 + 611524 = 264^2 + 782^2 .

It is a plaindrome in base 6.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (681221) by changing a digit.

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, 17011 + ... + 17050.

It is an arithmetic number, because the mean of its divisors is an integer number (119217).

2⁶⁸¹²²⁰ is an apocalyptic number.

It is an amenable number.

681220 is an abundant number, since it is smaller than the sum of its proper divisors (749384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681220 is a wasteful number, since it uses less digits than its factorization.

681220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34070 (or 34068 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 681220 is about 825.3605272849. The cubic root of 681220 is about 87.9891515552.

The spelling of 681220 in words is "six hundred eighty-one thousand, two hundred twenty".