7841787681 has 32 divisors (see below), whose sum is σ = 12886601728. Its totient is φ = 4130533440.

The previous prime is 7841787649. The next prime is 7841787691. The reversal of 7841787681 is 1867871487.

It is not a de Polignac number, because 7841787681 - 2⁵ = 7841787649 is a prime.

It is a super-2 number, since 2×7841787681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7841787631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178716 + ... + 218226.

It is an arithmetic number, because the mean of its divisors is an integer number (402706304).

Almost surely, 2^7841787681 is an apocalyptic number.

It is an amenable number.

7841787681 is a deficient number, since it is larger than the sum of its proper divisors (5044814047).

7841787681 is a wasteful number, since it uses less digits than its factorization.

7841787681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40261.

The product of its digits is 4214784, while the sum is 57.

The square root of 7841787681 is about 88553.8688087652. The cubic root of 7841787681 is about 1986.7277587171.

The spelling of 7841787681 in words is "seven billion, eight hundred forty-one million, seven hundred eighty-seven thousand, six hundred eighty-one".