815660 has 24 divisors (see below), whose sum is σ = 1814400. Its totient is φ = 306944.

The previous prime is 815653. The next prime is 815663. The reversal of 815660 is 66518.

It is not an unprimeable number, because it can be changed into a prime (815663) by changing a digit.

815660 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 7 ways as a sum of consecutive naturals, for example, 860 + ... + 1539.

It is an arithmetic number, because the mean of its divisors is an integer number (75600).

2⁸¹⁵⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

815660 is an abundant number, since it is smaller than the sum of its proper divisors (998740).

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

815660 is a wasteful number, since it uses less digits than its factorization.

815660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425 (or 2423 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 815660 is about 903.1389704802. The cubic root of 815660 is about 93.4335940732.

The spelling of 815660 in words is "eight hundred fifteen thousand, six hundred sixty".