831821056 has 72 divisors (see below), whose sum is σ = 1832241600. Its totient is φ = 373739520.

The previous prime is 831821027. The next prime is 831821063. The reversal of 831821056 is 650128138.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248965 + ... + 252283.

It is an arithmetic number, because the mean of its divisors is an integer number (25447800).

Almost surely, 2^831821056 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 831821056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (916120800).

831821056 is an abundant number, since it is smaller than the sum of its proper divisors (1000420544).

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

831821056 is a wasteful number, since it uses less digits than its factorization.

831821056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3435 (or 3421 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 831821056 is about 28841.3081534108. The cubic root of 831821056 is about 940.4664412096.

The spelling of 831821056 in words is "eight hundred thirty-one million, eight hundred twenty-one thousand, fifty-six".