7821424881 has 10 divisors (see below), whose sum is σ = 11683857042. Its totient is φ = 5214283200.

The previous prime is 7821424861. The next prime is 7821424969. The reversal of 7821424881 is 1884241287.

It can be written as a sum of positive squares in only one way, i.e., 7803072225 + 18352656 = 88335^2 + 4284^2 .

It is not a de Polignac number, because 7821424881 - 2⁶ = 7821424817 is a prime.

It is a super-2 number, since 2×7821424881² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7821424861) 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 9 ways as a sum of consecutive naturals, for example, 48280320 + ... + 48280481.

Almost surely, 2^7821424881 is an apocalyptic number.

It is an amenable number.

7821424881 is a deficient number, since it is larger than the sum of its proper divisors (3862432161).

7821424881 is an equidigital number, since it uses as much as digits as its factorization.

7821424881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96560813 (or 96560804 counting only the distinct ones).

The product of its digits is 229376, while the sum is 45.

The square root of 7821424881 is about 88438.8199887357. The cubic root of 7821424881 is about 1985.0066202428.

The spelling of 7821424881 in words is "seven billion, eight hundred twenty-one million, four hundred twenty-four thousand, eight hundred eighty-one".