816321926288 has 80 divisors (see below), whose sum is σ = 1762866633600. Its totient is φ = 363038807040.

The previous prime is 816321926261. The next prime is 816321926291. The reversal of 816321926288 is 882629123618.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3226868 + ... + 3470636.

It is an arithmetic number, because the mean of its divisors is an integer number (22035832920).

Almost surely, 2^816321926288 is an apocalyptic number.

816321926288 is a gapful number since it is divisible by the number (88) 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 816321926288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881433316800).

816321926288 is an abundant number, since it is smaller than the sum of its proper divisors (946544707312).

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

816321926288 is a wasteful number, since it uses less digits than its factorization.

816321926288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244200 (or 244194 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 56.

The spelling of 816321926288 in words is "eight hundred sixteen billion, three hundred twenty-one million, nine hundred twenty-six thousand, two hundred eighty-eight".