856684280 has 16 divisors (see below), whose sum is σ = 1927539720. Its totient is φ = 342673696.

The previous prime is 856684253. The next prime is 856684319. The reversal of 856684280 is 82486658.

856684280 is nontrivially palindromic in base 9.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10708514 + ... + 10708593.

Almost surely, 2^856684280 is an apocalyptic number.

It is an amenable number.

856684280 is an abundant number, since it is smaller than the sum of its proper divisors (1070855440).

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

856684280 is a wasteful number, since it uses less digits than its factorization.

856684280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21417118 (or 21417114 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 47.

The square root of 856684280 is about 29269.1694449979. The cubic root of 856684280 is about 949.7448178876.

The spelling of 856684280 in words is "eight hundred fifty-six million, six hundred eighty-four thousand, two hundred eighty".