681740 has 24 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 268928.

The previous prime is 681731. The next prime is 681763. The reversal of 681740 is 47186.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1589 + ... + 1971.

It is an arithmetic number, because the mean of its divisors is an integer number (60480).

2⁶⁸¹⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

681740 is an abundant number, since it is smaller than the sum of its proper divisors (769780).

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

681740 is a wasteful number, since it uses less digits than its factorization.

681740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 479 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 681740 is about 825.6754810457. The cubic root of 681740 is about 88.0115343008.

The spelling of 681740 in words is "six hundred eighty-one thousand, seven hundred forty".