822923640 has 288 divisors, whose sum is σ = 3394787760. Its totient is φ = 170956800.

The previous prime is 822923597. The next prime is 822923657. The reversal of 822923640 is 46329228.

822923640 is a `hidden beast` number, since 8 + 2 + 2 + 9 + 2 + 3 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 822923595 and 822923604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 191920 + ... + 196160.

Almost surely, 2^822923640 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 822923640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1697393880).

822923640 is an abundant number, since it is smaller than the sum of its proper divisors (2571864120).

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

822923640 is a wasteful number, since it uses less digits than its factorization.

822923640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4283 (or 4269 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 822923640 is about 28686.6456735534. The cubic root of 822923640 is about 937.1012405477.

The spelling of 822923640 in words is "eight hundred twenty-two million, nine hundred twenty-three thousand, six hundred forty".