856877647 has 2 divisors, whose sum is σ = 856877648. Its totient is φ = 856877646.

The previous prime is 856877611. The next prime is 856877653. The reversal of 856877647 is 746778658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856877647 - 2⁷ = 856877519 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 856877591 and 856877600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856877677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428438823 + 428438824.

It is an arithmetic number, because the mean of its divisors is an integer number (428438824).

Almost surely, 2^856877647 is an apocalyptic number.

856877647 is a deficient number, since it is larger than the sum of its proper divisors (1).

856877647 is an equidigital number, since it uses as much as digits as its factorization.

856877647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15805440, while the sum is 58.

The square root of 856877647 is about 29272.4725125842. The cubic root of 856877647 is about 949.8162699167.

The spelling of 856877647 in words is "eight hundred fifty-six million, eight hundred seventy-seven thousand, six hundred forty-seven".