856833780 has 96 divisors (see below), whose sum is σ = 2634226560. Its totient is φ = 206369280.

The previous prime is 856833727. The next prime is 856833793. The reversal of 856833780 is 87338658.

It is a happy number.

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, 99486 + ... + 107754.

It is an arithmetic number, because the mean of its divisors is an integer number (27439860).

Almost surely, 2^856833780 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 856833780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317113280).

856833780 is an abundant number, since it is smaller than the sum of its proper divisors (1777392780).

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

856833780 is a wasteful number, since it uses less digits than its factorization.

856833780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8449 (or 8447 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The square root of 856833780 is about 29271.7232154173. The cubic root of 856833780 is about 949.8000613399.

The spelling of 856833780 in words is "eight hundred fifty-six million, eight hundred thirty-three thousand, seven hundred eighty".