856747715 has 16 divisors (see below), whose sum is σ = 1090744320. Its totient is φ = 644202720.

The previous prime is 856747711. The next prime is 856747741. The reversal of 856747715 is 517747658.

856747715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 856747715 - 2² = 856747711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (856747711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23441 + ... + 47570.

It is an arithmetic number, because the mean of its divisors is an integer number (68171520).

Almost surely, 2^856747715 is an apocalyptic number.

856747715 is a deficient number, since it is larger than the sum of its proper divisors (233996605).

856747715 is a wasteful number, since it uses less digits than its factorization.

856747715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71162.

The product of its digits is 1646400, while the sum is 50.

The square root of 856747715 is about 29270.2530737266. The cubic root of 856747715 is about 949.7682592638.

The spelling of 856747715 in words is "eight hundred fifty-six million, seven hundred forty-seven thousand, seven hundred fifteen".