809145056 has 24 divisors (see below), whose sum is σ = 1686711600. Its totient is φ = 380773888.

The previous prime is 809145049. The next prime is 809145059. The reversal of 809145056 is 650541908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809145059) 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, 743156 + ... + 744243.

It is an arithmetic number, because the mean of its divisors is an integer number (70279650).

Almost surely, 2^809145056 is an apocalyptic number.

It is an amenable number.

809145056 is an abundant number, since it is smaller than the sum of its proper divisors (877566544).

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

809145056 is a wasteful number, since it uses less digits than its factorization.

809145056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487426 (or 1487418 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 809145056 is about 28445.4751410484. The cubic root of 809145056 is about 931.8416721599.

The spelling of 809145056 in words is "eight hundred nine million, one hundred forty-five thousand, fifty-six".