681580 has 24 divisors (see below), whose sum is σ = 1460592. Its totient is φ = 267072.

The previous prime is 681563. The next prime is 681589. The reversal of 681580 is 85186.

It is a happy number.

681580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (681589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 739 + ... + 1381.

It is an arithmetic number, because the mean of its divisors is an integer number (60858).

2⁶⁸¹⁵⁸⁰ is an apocalyptic number.

It is an amenable number.

681580 is an abundant number, since it is smaller than the sum of its proper divisors (779012).

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

681580 is a wasteful number, since it uses less digits than its factorization.

681580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705 (or 703 counting only the distinct ones).

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

The square root of 681580 is about 825.5785849936. The cubic root of 681580 is about 88.0046485148.

The spelling of 681580 in words is "six hundred eighty-one thousand, five hundred eighty".