8044871781 has 16 divisors (see below), whose sum is σ = 10911539520. Its totient is φ = 5270780160.

The previous prime is 8044871773. The next prime is 8044871789. The reversal of 8044871781 is 1871784408.

It is an interprime number because it is at equal distance from previous prime (8044871773) and next prime (8044871789).

It is not a de Polignac number, because 8044871781 - 2³ = 8044871773 is a prime.

It is a super-2 number, since 2×8044871781² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8044871781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8044871789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1143631 + ... + 1150643.

It is an arithmetic number, because the mean of its divisors is an integer number (681971220).

Almost surely, 2^8044871781 is an apocalyptic number.

It is an amenable number.

8044871781 is a deficient number, since it is larger than the sum of its proper divisors (2866667739).

8044871781 is a wasteful number, since it uses less digits than its factorization.

8044871781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13556.

The product of its (nonzero) digits is 401408, while the sum is 48.

The square root of 8044871781 is about 89693.2092245561. The cubic root of 8044871781 is about 2003.7323455489.

The spelling of 8044871781 in words is "eight billion, forty-four million, eight hundred seventy-one thousand, seven hundred eighty-one".