811660 has 12 divisors (see below), whose sum is σ = 1704528. Its totient is φ = 324656.

The previous prime is 811651. The next prime is 811667. The reversal of 811660 is 66118.

It is not an unprimeable number, because it can be changed into a prime (811667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20272 + ... + 20311.

It is an arithmetic number, because the mean of its divisors is an integer number (142044).

2⁸¹¹⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

811660 is an abundant number, since it is smaller than the sum of its proper divisors (892868).

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

811660 is a wasteful number, since it uses less digits than its factorization.

811660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40592 (or 40590 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 811660 is about 900.9217502092. The cubic root of 811660 is about 93.2806108131.

Adding to 811660 its reverse (66118), we get a palindrome (877778).

The spelling of 811660 in words is "eight hundred eleven thousand, six hundred sixty".