681700 has 36 divisors (see below), whose sum is σ = 1570212. Its totient is φ = 256000.

The previous prime is 681689. The next prime is 681719. The reversal of 681700 is 7186.

681700 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 79524 + 602176 = 282^2 + 776^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1500 + ... + 1900.

It is an arithmetic number, because the mean of its divisors is an integer number (43617).

2⁶⁸¹⁷⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (785106).

681700 is an abundant number, since it is smaller than the sum of its proper divisors (888512).

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

681700 is a wasteful number, since it uses less digits than its factorization.

681700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 681700 is about 825.6512580987. The cubic root of 681700 is about 88.0098129553.

Adding to 681700 its reverse (7186), we get a palindrome (688886).

It can be divided in two parts, 68 and 1700, that multiplied together give a square (115600 = 340²).

The spelling of 681700 in words is "six hundred eighty-one thousand, seven hundred".