8009320781 has 16 divisors (see below), whose sum is σ = 10511208960. Its totient is φ = 5912552880.

The previous prime is 8009320777. The next prime is 8009320799. The reversal of 8009320781 is 1870239008.

It is a cyclic number.

It is not a de Polignac number, because 8009320781 - 2² = 8009320777 is a prime.

It is a super-2 number, since 2×8009320781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8009220781) 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, 2735831 + ... + 2738756.

It is an arithmetic number, because the mean of its divisors is an integer number (656950560).

Almost surely, 2^8009320781 is an apocalyptic number.

It is an amenable number.

8009320781 is a deficient number, since it is larger than the sum of its proper divisors (2501888179).

8009320781 is a wasteful number, since it uses less digits than its factorization.

8009320781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5474624.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 8009320781 is about 89494.8086818448. The cubic root of 8009320781 is about 2000.7764302890.

Adding to 8009320781 its reverse (1870239008), we get a palindrome (9879559789).

The spelling of 8009320781 in words is "eight billion, nine million, three hundred twenty thousand, seven hundred eighty-one".