856924818320 has 20 divisors (see below), whose sum is σ = 1992350202780. Its totient is φ = 342769927296.

The previous prime is 856924818289. The next prime is 856924818391. The reversal of 856924818320 is 23818429658.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 475084861696 + 381839956624 = 689264^2 + 617932^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 5355780035 + ... + 5355780194.

It is an arithmetic number, because the mean of its divisors is an integer number (99617510139).

Almost surely, 2^856924818320 is an apocalyptic number.

856924818320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

856924818320 is an abundant number, since it is smaller than the sum of its proper divisors (1135425384460).

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

856924818320 is a wasteful number, since it uses less digits than its factorization.

856924818320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10711560242 (or 10711560236 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 56.

The spelling of 856924818320 in words is "eight hundred fifty-six billion, nine hundred twenty-four million, eight hundred eighteen thousand, three hundred twenty".