856305272 has 64 divisors (see below), whose sum is σ = 1741824000. Its totient is φ = 393441664.

The previous prime is 856305269. The next prime is 856305287. The reversal of 856305272 is 272503658.

Together with 885518728 it forms an amicable pair .

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2043479 + ... + 2043897.

It is an arithmetic number, because the mean of its divisors is an integer number (27216000).

Almost surely, 2^856305272 is an apocalyptic number.

It is an amenable number.

856305272 is an abundant number, since it is smaller than the sum of its proper divisors (885518728).

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

856305272 is a wasteful number, since it uses less digits than its factorization.

856305272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 856 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 856305272 is about 29262.6942026875. The cubic root of 856305272 is about 949.6047375067.

The spelling of 856305272 in words is "eight hundred fifty-six million, three hundred five thousand, two hundred seventy-two".