811668 has 72 divisors (see below), whose sum is σ = 2293984. Its totient is φ = 221760.

The previous prime is 811667. The next prime is 811691. The reversal of 811668 is 866118.

Its product of digits (2304) is a multiple of the sum of its prime divisors (72).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 18855 + ... + 18897.

2⁸¹¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1146992).

811668 is an abundant number, since it is smaller than the sum of its proper divisors (1482316).

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

811668 is a wasteful number, since it uses less digits than its factorization.

811668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 72 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 811668 is about 900.9261900955. The cubic root of 811668 is about 93.2809172806.

The spelling of 811668 in words is "eight hundred eleven thousand, six hundred sixty-eight".