7871881787 has 16 divisors (see below), whose sum is σ = 9845881344. Its totient is φ = 6114192000.

The previous prime is 7871881783. The next prime is 7871881789.

7871881787 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 7871881787 - 2² = 7871881783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7871881783) 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, 140414 + ... + 188307.

It is an arithmetic number, because the mean of its divisors is an integer number (615367584).

Almost surely, 2^7871881787 is an apocalyptic number.

7871881787 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

7871881787 is a deficient number, since it is larger than the sum of its proper divisors (1973999557).

7871881787 is a wasteful number, since it uses less digits than its factorization.

7871881787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329050.

The product of its digits is 9834496, while the sum is 62.

The square root of 7871881787 is about 88723.6258670711. The cubic root of 7871881787 is about 1989.2659756748.

The spelling of 7871881787 in words is "seven billion, eight hundred seventy-one million, eight hundred eighty-one thousand, seven hundred eighty-seven".