7938687081 has 32 divisors (see below), whose sum is σ = 12116901888. Its totient is φ = 4579983360.

The previous prime is 7938687079. The next prime is 7938687083. The reversal of 7938687081 is 1807868397.

It is an interprime number because it is at equal distance from previous prime (7938687079) and next prime (7938687083).

It is not a de Polignac number, because 7938687081 - 2¹ = 7938687079 is a prime.

It is a super-2 number, since 2×7938687081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7938687083) 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, 147096 + ... + 193686.

It is an arithmetic number, because the mean of its divisors is an integer number (378653184).

Almost surely, 2^7938687081 is an apocalyptic number.

It is an amenable number.

7938687081 is a deficient number, since it is larger than the sum of its proper divisors (4178214807).

7938687081 is a wasteful number, since it uses less digits than its factorization.

7938687081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46881.

The product of its (nonzero) digits is 4064256, while the sum is 57.

The square root of 7938687081 is about 89099.3102161852. The cubic root of 7938687081 is about 1994.8774811852.

The spelling of 7938687081 in words is "seven billion, nine hundred thirty-eight million, six hundred eighty-seven thousand, eighty-one".