856856478 has 8 divisors (see below), whose sum is σ = 1713712968. Its totient is φ = 285618824.

The previous prime is 856856477. The next prime is 856856479. The reversal of 856856478 is 874658658.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (856856477) and next prime (856856479).

It is a sphenic number, since it is the product of 3 distinct primes.

856856478 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856856477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71404701 + ... + 71404712.

It is an arithmetic number, because the mean of its divisors is an integer number (214214121).

Almost surely, 2^856856478 is an apocalyptic number.

856856478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

856856478 is a wasteful number, since it uses less digits than its factorization.

856856478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142809418.

The product of its digits is 12902400, while the sum is 57.

The square root of 856856478 is about 29272.1109249060. The cubic root of 856856478 is about 949.8084481753.

The spelling of 856856478 in words is "eight hundred fifty-six million, eight hundred fifty-six thousand, four hundred seventy-eight".