823615056 has 90 divisors (see below), whose sum is σ = 2533624730. Its totient is φ = 249575040.

The previous prime is 823615049. The next prime is 823615061. The reversal of 823615056 is 650516328.

It can be written as a sum of positive squares in only one way, i.e., 457275456 + 366339600 = 21384^2 + 19140^2 .

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 823615056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6211 + ... + 41058.

Almost surely, 2^823615056 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 823615056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1266812365).

823615056 is an abundant number, since it is smaller than the sum of its proper divisors (1710009674).

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

823615056 is a wasteful number, since it uses less digits than its factorization.

823615056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47305 (or 47285 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 823615056 is about 28698.6943257006. The cubic root of 823615056 is about 937.3636162137.

The spelling of 823615056 in words is "eight hundred twenty-three million, six hundred fifteen thousand, fifty-six".