856473804 has 72 divisors (see below), whose sum is σ = 2354551920. Its totient is φ = 268304256.

The previous prime is 856473803. The next prime is 856473823. The reversal of 856473804 is 408374658.

856473804 is a `hidden beast` number, since 8 + 564 + 7 + 3 + 80 + 4 = 666.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 856473804.

It is not an unprimeable number, because it can be changed into a prime (856473803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1253647 + ... + 1254329.

It is an arithmetic number, because the mean of its divisors is an integer number (32702110).

Almost surely, 2^856473804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856473804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1177275960).

856473804 is an abundant number, since it is smaller than the sum of its proper divisors (1498078116).

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

856473804 is a wasteful number, since it uses less digits than its factorization.

856473804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The square root of 856473804 is about 29265.5737001686. The cubic root of 856473804 is about 949.6670316023.

The spelling of 856473804 in words is "eight hundred fifty-six million, four hundred seventy-three thousand, eight hundred four".