7881744533 has 16 divisors (see below), whose sum is σ = 8654745456. Its totient is φ = 7132769280.

The previous prime is 7881744509. The next prime is 7881744539. The reversal of 7881744533 is 3354471887.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1439595364 + 6442149169 = 37942^2 + 80263^2 .

It is not a de Polignac number, because 7881744533 - 2¹⁴ = 7881728149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881744539) 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 in 15 ways as a sum of consecutive naturals, for example, 1113341 + ... + 1120397.

It is an arithmetic number, because the mean of its divisors is an integer number (540921591).

Almost surely, 2^7881744533 is an apocalyptic number.

It is an amenable number.

7881744533 is a deficient number, since it is larger than the sum of its proper divisors (773000923).

7881744533 is a wasteful number, since it uses less digits than its factorization.

7881744533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8744.

The product of its digits is 2257920, while the sum is 50.

The square root of 7881744533 is about 88779.1897518782. The cubic root of 7881744533 is about 1990.0964182301.

The spelling of 7881744533 in words is "seven billion, eight hundred eighty-one million, seven hundred forty-four thousand, five hundred thirty-three".