8209761644 has 36 divisors (see below), whose sum is σ = 16721563320. Its totient is φ = 3516609600.

The previous prime is 8209761631. The next prime is 8209761671. The reversal of 8209761644 is 4461679028.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 399419 + ... + 419469.

It is an arithmetic number, because the mean of its divisors is an integer number (464487870).

Almost surely, 2^8209761644 is an apocalyptic number.

It is an amenable number.

8209761644 is an abundant number, since it is smaller than the sum of its proper divisors (8511801676).

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

8209761644 is a wasteful number, since it uses less digits than its factorization.

8209761644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22158 (or 22149 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 8209761644 is about 90607.7350119735. The cubic root of 8209761644 is about 2017.3295467144.

The spelling of 8209761644 in words is "eight billion, two hundred nine million, seven hundred sixty-one thousand, six hundred forty-four".