7281828866 has 8 divisors (see below), whose sum is σ = 11762954364. Its totient is φ = 3360844080.

The previous prime is 7281828809. The next prime is 7281828887. The reversal of 7281828866 is 6688281827.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6117586225 + 1164242641 = 78215^2 + 34121^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140035145 + ... + 140035196.

Almost surely, 2^7281828866 is an apocalyptic number.

7281828866 is a deficient number, since it is larger than the sum of its proper divisors (4481125498).

7281828866 is a wasteful number, since it uses less digits than its factorization.

7281828866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280070356.

The product of its digits is 4128768, while the sum is 56.

The square root of 7281828866 is about 85333.6326778604. The cubic root of 7281828866 is about 1938.2664985608.

The spelling of 7281828866 in words is "seven billion, two hundred eighty-one million, eight hundred twenty-eight thousand, eight hundred sixty-six".