809774540244 has 72 divisors (see below), whose sum is σ = 2080548288000. Its totient is φ = 265517089344.

The previous prime is 809774540209. The next prime is 809774540249. The reversal of 809774540244 is 442045477908.

809774540244 is a `hidden beast` number, since 8 + 0 + 9 + 7 + 74 + 540 + 24 + 4 = 666.

809774540244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809774540249) 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, 235797 + ... + 1294275.

It is an arithmetic number, because the mean of its divisors is an integer number (28896504000).

Almost surely, 2^809774540244 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 809774540244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1040274144000).

809774540244 is an abundant number, since it is smaller than the sum of its proper divisors (1270773747756).

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

809774540244 is a wasteful number, since it uses less digits than its factorization.

809774540244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058837 (or 1058832 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 54.

The spelling of 809774540244 in words is "eight hundred nine billion, seven hundred seventy-four million, five hundred forty thousand, two hundred forty-four".