681530 has 32 divisors (see below), whose sum is σ = 1373760. Its totient is φ = 241920.

The previous prime is 681523. The next prime is 681539. The reversal of 681530 is 35186.

681530 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 = 681496 and 681505.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681530.

It is not an unprimeable number, because it can be changed into a prime (681539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3125 + ... + 3335.

It is an arithmetic number, because the mean of its divisors is an integer number (42930).

2⁶⁸¹⁵³⁰ is an apocalyptic number.

681530 is an abundant number, since it is smaller than the sum of its proper divisors (692230).

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

681530 is a wasteful number, since it uses less digits than its factorization.

681530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 681530 is about 825.5483026450. The cubic root of 681530 is about 88.0024964856.

The spelling of 681530 in words is "six hundred eighty-one thousand, five hundred thirty".