7281828809 has 2 divisors, whose sum is σ = 7281828810. Its totient is φ = 7281828808.

The previous prime is 7281828803. The next prime is 7281828887. The reversal of 7281828809 is 9088281827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7148195209 + 133633600 = 84547^2 + 11560^2 .

It is a cyclic number.

It is not a de Polignac number, because 7281828809 - 2¹² = 7281824713 is a prime.

It is a super-3 number, since 3×7281828809³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (7281828803) by changing a digit.

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 as a sum of consecutive naturals, namely, 3640914404 + 3640914405.

It is an arithmetic number, because the mean of its divisors is an integer number (3640914405).

Almost surely, 2^7281828809 is an apocalyptic number.

It is an amenable number.

7281828809 is a deficient number, since it is larger than the sum of its proper divisors (1).

7281828809 is an equidigital number, since it uses as much as digits as its factorization.

7281828809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1032192, while the sum is 53.

The square root of 7281828809 is about 85333.6323438772. The cubic root of 7281828809 is about 1938.2664935034.

The spelling of 7281828809 in words is "seven billion, two hundred eighty-one million, eight hundred twenty-eight thousand, eight hundred nine".