7978087881 has 24 divisors (see below), whose sum is σ = 11568357216. Its totient is φ = 5298249600.

The previous prime is 7978087867. The next prime is 7978087907. The reversal of 7978087881 is 1887808797.

It is not a de Polignac number, because 7978087881 - 2⁵ = 7978087849 is a prime.

It is a super-2 number, since 2×7978087881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7978087681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4629486 + ... + 4631208.

It is an arithmetic number, because the mean of its divisors is an integer number (482014884).

Almost surely, 2^7978087881 is an apocalyptic number.

It is an amenable number.

7978087881 is a deficient number, since it is larger than the sum of its proper divisors (3590269335).

7978087881 is a wasteful number, since it uses less digits than its factorization.

7978087881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3413 (or 3410 counting only the distinct ones).

The product of its (nonzero) digits is 12644352, while the sum is 63.

The square root of 7978087881 is about 89320.1426387128. The cubic root of 7978087881 is about 1998.1723203857.

The spelling of 7978087881 in words is "seven billion, nine hundred seventy-eight million, eighty-seven thousand, eight hundred eighty-one".