681850 has 24 divisors (see below), whose sum is σ = 1367100. Its totient is φ = 251520.

The previous prime is 681841. The next prime is 681883. The reversal of 681850 is 58186.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 273529 + 408321 = 523^2 + 639^2 .

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, 126 + ... + 1174.

2⁶⁸¹⁸⁵⁰ is an apocalyptic number.

681850 is an abundant number, since it is smaller than the sum of its proper divisors (685250).

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

681850 is a wasteful number, since it uses less digits than its factorization.

681850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074 (or 1069 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 681850 is about 825.7420904859. The cubic root of 681850 is about 88.0162676537.

The spelling of 681850 in words is "six hundred eighty-one thousand, eight hundred fifty".