681140 has 12 divisors (see below), whose sum is σ = 1430436. Its totient is φ = 272448.

The previous prime is 681137. The next prime is 681151. The reversal of 681140 is 41186.

It can be written as a sum of positive squares in 2 ways, for example, as 425104 + 256036 = 652^2 + 506^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 34057 = 681140 / (6 + 8 + 1 + 1 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17009 + ... + 17048.

It is an arithmetic number, because the mean of its divisors is an integer number (119203).

2⁶⁸¹¹⁴⁰ is an apocalyptic number.

It is an amenable number.

681140 is an abundant number, since it is smaller than the sum of its proper divisors (749296).

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

681140 is a wasteful number, since it uses less digits than its factorization.

681140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34066 (or 34064 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 681140 is about 825.3120621922. The cubic root of 681140 is about 87.9857070451.

The spelling of 681140 in words is "six hundred eighty-one thousand, one hundred forty".