856775920 has 240 divisors, whose sum is σ = 2692541952. Its totient is φ = 246205440.

The previous prime is 856775891. The next prime is 856775929. The reversal of 856775920 is 29577658.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856775929) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1040629 + ... + 1041451.

Almost surely, 2^856775920 is an apocalyptic number.

856775920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856775920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346270976).

856775920 is an abundant number, since it is smaller than the sum of its proper divisors (1835766032).

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

856775920 is a wasteful number, since it uses less digits than its factorization.

856775920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 856775920 is about 29270.7348729068. The cubic root of 856775920 is about 949.7786815928.

The spelling of 856775920 in words is "eight hundred fifty-six million, seven hundred seventy-five thousand, nine hundred twenty".