822115780 has 48 divisors (see below), whose sum is σ = 1810534320. Its totient is φ = 313141248.

The previous prime is 822115771. The next prime is 822115781. The reversal of 822115780 is 87511228.

It can be written as a sum of positive squares in 8 ways, for example, as 120077764 + 702038016 = 10958^2 + 26496^2 .

It is not an unprimeable number, because it can be changed into a prime (822115781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32632 + ... + 52048.

It is an arithmetic number, because the mean of its divisors is an integer number (37719465).

Almost surely, 2^822115780 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 822115780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (905267160).

822115780 is an abundant number, since it is smaller than the sum of its proper divisors (988418540).

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

822115780 is a wasteful number, since it uses less digits than its factorization.

822115780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19528 (or 19526 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 822115780 is about 28672.5614481860. The cubic root of 822115780 is about 936.7944909555.

The spelling of 822115780 in words is "eight hundred twenty-two million, one hundred fifteen thousand, seven hundred eighty".