822820856 has 64 divisors (see below), whose sum is σ = 1830366720. Its totient is φ = 341838720.

The previous prime is 822820849. The next prime is 822820861. The reversal of 822820856 is 658028228.

It is a super-2 number, since 2×822820856² = 1354068322137145472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114341 + ... + 121323.

It is an arithmetic number, because the mean of its divisors is an integer number (28599480).

Almost surely, 2^822820856 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 822820856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (915183360).

822820856 is an abundant number, since it is smaller than the sum of its proper divisors (1007545864).

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

822820856 is a wasteful number, since it uses less digits than its factorization.

822820856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7116 (or 7112 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 41.

The square root of 822820856 is about 28684.8541219927. The cubic root of 822820856 is about 937.0622239571.

The spelling of 822820856 in words is "eight hundred twenty-two million, eight hundred twenty thousand, eight hundred fifty-six".