681330 has 32 divisors (see below), whose sum is σ = 1761984. Its totient is φ = 167616.

The previous prime is 681311. The next prime is 681337. The reversal of 681330 is 33186.

681330 = T₄₄ + T₄₅ + ... + T₁₆₀.

681330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 681297 and 681306.

It is not an unprimeable number, because it can be changed into a prime (681337) by changing a digit.

681330 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 15 ways as a sum of consecutive naturals, for example, 484 + ... + 1263.

It is an arithmetic number, because the mean of its divisors is an integer number (55062).

2⁶⁸¹³³⁰ is an apocalyptic number.

681330 is an abundant number, since it is smaller than the sum of its proper divisors (1080654).

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

681330 is a wasteful number, since it uses less digits than its factorization.

681330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 681330 is about 825.4271621409. The cubic root of 681330 is about 87.9938873165.

The spelling of 681330 in words is "six hundred eighty-one thousand, three hundred thirty".