856258780 has 60 divisors (see below), whose sum is σ = 1949283000. Its totient is φ = 315946176.

The previous prime is 856258759. The next prime is 856258783. The reversal of 856258780 is 87852658.

It is a happy number.

856258780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856258783) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 570471 + ... + 571969.

It is an arithmetic number, because the mean of its divisors is an integer number (32488050).

Almost surely, 2^856258780 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 856258780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (974641500).

856258780 is an abundant number, since it is smaller than the sum of its proper divisors (1093024220).

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

856258780 is a wasteful number, since it uses less digits than its factorization.

856258780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1519 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 49.

The square root of 856258780 is about 29261.8998016192. The cubic root of 856258780 is about 949.5875513372.

The spelling of 856258780 in words is "eight hundred fifty-six million, two hundred fifty-eight thousand, seven hundred eighty".