856728222 has 16 divisors (see below), whose sum is σ = 1958236032. Its totient is φ = 244779480.

The previous prime is 856728193. The next prime is 856728239. The reversal of 856728222 is 222827658.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 20398291 = 856728222 / (8 + 5 + 6 + 7 + 2 + 8 + 2 + 2 + 2).

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 7 ways as a sum of consecutive naturals, for example, 10199104 + ... + 10199187.

It is an arithmetic number, because the mean of its divisors is an integer number (122389752).

Almost surely, 2^856728222 is an apocalyptic number.

856728222 is an abundant number, since it is smaller than the sum of its proper divisors (1101507810).

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

856728222 is a wasteful number, since it uses less digits than its factorization.

856728222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20398303.

The product of its digits is 215040, while the sum is 42.

The square root of 856728222 is about 29269.9200887191. The cubic root of 856728222 is about 949.7610560647.

The spelling of 856728222 in words is "eight hundred fifty-six million, seven hundred twenty-eight thousand, two hundred twenty-two".