821833056 has 144 divisors (see below), whose sum is σ = 2660636160. Its totient is φ = 238191360.

The previous prime is 821833037. The next prime is 821833073. The reversal of 821833056 is 650338128.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 821833056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67225 + ... + 78503.

It is an arithmetic number, because the mean of its divisors is an integer number (18476640).

Almost surely, 2^821833056 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 821833056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1330318080).

821833056 is an abundant number, since it is smaller than the sum of its proper divisors (1838803104).

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

821833056 is a wasteful number, since it uses less digits than its factorization.

821833056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11329 (or 11318 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 821833056 is about 28667.6308054921. The cubic root of 821833056 is about 936.6870913820.

The spelling of 821833056 in words is "eight hundred twenty-one million, eight hundred thirty-three thousand, fifty-six".