809774516 has 12 divisors (see below), whose sum is σ = 1430107140. Its totient is φ = 401172480.

The previous prime is 809774513. The next prime is 809774561. The reversal of 809774516 is 615477908.

It can be written as a sum of positive squares in 2 ways, for example, as 554414116 + 255360400 = 23546^2 + 15980^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809774513) 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, 928205 + ... + 929076.

It is an arithmetic number, because the mean of its divisors is an integer number (119175595).

Almost surely, 2^809774516 is an apocalyptic number.

It is an amenable number.

809774516 is a deficient number, since it is larger than the sum of its proper divisors (620332624).

809774516 is a wasteful number, since it uses less digits than its factorization.

809774516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857394 (or 1857392 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 809774516 is about 28456.5373157030. The cubic root of 809774516 is about 932.0832460779.

The spelling of 809774516 in words is "eight hundred nine million, seven hundred seventy-four thousand, five hundred sixteen".