8278721812 has 24 divisors (see below), whose sum is σ = 15342820416. Its totient is φ = 3895148928.

The previous prime is 8278721791. The next prime is 8278721839. The reversal of 8278721812 is 2181278728.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 608193 + ... + 621655.

It is an arithmetic number, because the mean of its divisors is an integer number (639284184).

Almost surely, 2^8278721812 is an apocalyptic number.

It is an amenable number.

8278721812 is a deficient number, since it is larger than the sum of its proper divisors (7064098604).

8278721812 is a wasteful number, since it uses less digits than its factorization.

8278721812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22527 (or 22525 counting only the distinct ones).

The product of its digits is 200704, while the sum is 46.

The square root of 8278721812 is about 90987.4816224738. The cubic root of 8278721812 is about 2022.9621779360.

The spelling of 8278721812 in words is "eight billion, two hundred seventy-eight million, seven hundred twenty-one thousand, eight hundred twelve".