820902222 has 64 divisors (see below), whose sum is σ = 2207485440. Its totient is φ = 220745088.

The previous prime is 820902209. The next prime is 820902233. The reversal of 820902222 is 222209028.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57448 + ... + 70299.

It is an arithmetic number, because the mean of its divisors is an integer number (34491960).

Almost surely, 2^820902222 is an apocalyptic number.

820902222 is an abundant number, since it is smaller than the sum of its proper divisors (1386583218).

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

820902222 is a wasteful number, since it uses less digits than its factorization.

820902222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127782 (or 127776 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 820902222 is about 28651.3912751196. The cubic root of 820902222 is about 936.3333173506. Note that the first 4 decimals are identical.

The spelling of 820902222 in words is "eight hundred twenty million, nine hundred two thousand, two hundred twenty-two".