811089231840 has 384 divisors, whose sum is σ = 2863115942400. Its totient is φ = 214446735360.

The previous prime is 811089231773. The next prime is 811089231881. The reversal of 811089231840 is 48132980118.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 275973091 + ... + 275976029.

It is an arithmetic number, because the mean of its divisors is an integer number (7456031100).

Almost surely, 2^811089231840 is an apocalyptic number.

811089231840 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 811089231840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431557971200).

811089231840 is an abundant number, since it is smaller than the sum of its proper divisors (2052026710560).

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

811089231840 is a wasteful number, since it uses less digits than its factorization.

811089231840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3487 (or 3473 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The spelling of 811089231840 in words is "eight hundred eleven billion, eighty-nine million, two hundred thirty-one thousand, eight hundred forty".