8120784205 has 16 divisors (see below), whose sum is σ = 10261278720. Its totient is φ = 6152632128.

The previous prime is 8120784193. The next prime is 8120784229. The reversal of 8120784205 is 5024870218.

It is a cyclic number.

It is not a de Polignac number, because 8120784205 - 2¹⁷ = 8120653133 is a prime.

It is a super-2 number, since 2×8120784205² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307764 + ... + 333106.

It is an arithmetic number, because the mean of its divisors is an integer number (641329920).

Almost surely, 2^8120784205 is an apocalyptic number.

It is an amenable number.

8120784205 is a deficient number, since it is larger than the sum of its proper divisors (2140494515).

8120784205 is a wasteful number, since it uses less digits than its factorization.

8120784205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28740.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 8120784205 is about 90115.3938292454. The cubic root of 8120784205 is about 2010.0151154363.

The spelling of 8120784205 in words is "eight billion, one hundred twenty million, seven hundred eighty-four thousand, two hundred five".