856868013 has 48 divisors (see below), whose sum is σ = 1333148544. Its totient is φ = 529077120.

The previous prime is 856868011. The next prime is 856868041. The reversal of 856868013 is 310868658.

856868013 is a `hidden beast` number, since 8 + 568 + 6 + 80 + 1 + 3 = 666.

It is not a de Polignac number, because 856868013 - 2¹ = 856868011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856868013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856868011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 910123 + ... + 911063.

It is an arithmetic number, because the mean of its divisors is an integer number (27773928).

Almost surely, 2^856868013 is an apocalyptic number.

856868013 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

It is an amenable number.

856868013 is a deficient number, since it is larger than the sum of its proper divisors (476280531).

856868013 is a wasteful number, since it uses less digits than its factorization.

856868013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106 (or 1103 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 856868013 is about 29272.3079547889. The cubic root of 856868013 is about 949.8127102625.

The spelling of 856868013 in words is "eight hundred fifty-six million, eight hundred sixty-eight thousand, thirteen".