681730 has 16 divisors (see below), whose sum is σ = 1402560. Its totient is φ = 233712.

The previous prime is 681727. The next prime is 681731. The reversal of 681730 is 37186.

It is a junction number, because it is equal to n+sod(n) for n = 681695 and 681704.

It is not an unprimeable number, because it can be changed into a prime (681731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4800 + ... + 4939.

It is an arithmetic number, because the mean of its divisors is an integer number (87660).

2⁶⁸¹⁷³⁰ is an apocalyptic number.

681730 is an abundant number, since it is smaller than the sum of its proper divisors (720830).

It is a weird number, because it is abundant, but not a pseudoperfect number.

681730 is a wasteful number, since it uses less digits than its factorization.

681730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9753.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 681730 is about 825.6694253756. The cubic root of 681730 is about 88.0111039707.

The spelling of 681730 in words is "six hundred eighty-one thousand, seven hundred thirty".