856215268 has 24 divisors (see below), whose sum is σ = 1589376600. Its totient is φ = 402198528.

The previous prime is 856215263. The next prime is 856215287. The reversal of 856215268 is 862512658.

It can be written as a sum of positive squares in 4 ways, for example, as 312299584 + 543915684 = 17672^2 + 23322^2 .

It is not an unprimeable number, because it can be changed into a prime (856215263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27628 + ... + 49756.

It is an arithmetic number, because the mean of its divisors is an integer number (66224025).

Almost surely, 2^856215268 is an apocalyptic number.

It is an amenable number.

856215268 is a deficient number, since it is larger than the sum of its proper divisors (733161332).

856215268 is a wasteful number, since it uses less digits than its factorization.

856215268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22719 (or 22717 counting only the distinct ones).

The product of its digits is 230400, while the sum is 43.

The square root of 856215268 is about 29261.1562997774. The cubic root of 856215268 is about 949.5714661870.

The spelling of 856215268 in words is "eight hundred fifty-six million, two hundred fifteen thousand, two hundred sixty-eight".