811818000 has 480 divisors, whose sum is σ = 3440136960. Its totient is φ = 174182400.

The previous prime is 811817989. The next prime is 811818001. The reversal of 811818000 is 818118.

It is not an unprimeable number, because it can be changed into a prime (811818001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2141811 + ... + 2142189.

It is an arithmetic number, because the mean of its divisors is an integer number (7166952).

Almost surely, 2^811818000 is an apocalyptic number.

811818000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811818000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1720068480).

811818000 is an abundant number, since it is smaller than the sum of its proper divisors (2628318960).

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

811818000 is a wasteful number, since it uses less digits than its factorization.

811818000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 27.

The square root of 811818000 is about 28492.4200446364. The cubic root of 811818000 is about 932.8666317500.

The spelling of 811818000 in words is "eight hundred eleven million, eight hundred eighteen thousand".