681670 has 16 divisors (see below), whose sum is σ = 1338768. Its totient is φ = 247840.

The previous prime is 681647. The next prime is 681673. The reversal of 681670 is 76186.

681670 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681673) by changing a digit.

681670 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2989 + ... + 3208.

It is an arithmetic number, because the mean of its divisors is an integer number (83673).

2⁶⁸¹⁶⁷⁰ is an apocalyptic number.

681670 is a deficient number, since it is larger than the sum of its proper divisors (657098).

681670 is a wasteful number, since it uses less digits than its factorization.

681670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6215.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 681670 is about 825.6330904221. The cubic root of 681670 is about 88.0085219020.

It can be divided in two parts, 6816 and 70, that added together give a palindrome (6886).

The spelling of 681670 in words is "six hundred eighty-one thousand, six hundred seventy".