7881331887 has 64 divisors (see below), whose sum is σ = 14052165120. Its totient is φ = 4301510400.

The previous prime is 7881331883. The next prime is 7881331891.

7881331887 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (7881331883) and next prime (7881331891).

It is not a de Polignac number, because 7881331887 - 2² = 7881331883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881331883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 133408 + ... + 183194.

It is an arithmetic number, because the mean of its divisors is an integer number (219565080).

Almost surely, 2^7881331887 is an apocalyptic number.

7881331887 is a deficient number, since it is larger than the sum of its proper divisors (6170833233).

7881331887 is a wasteful number, since it uses less digits than its factorization.

7881331887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49861 (or 49855 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The square root of 7881331887 is about 88776.8657196232. The cubic root of 7881331887 is about 1990.0616873549.

The spelling of 7881331887 in words is "seven billion, eight hundred eighty-one million, three hundred thirty-one thousand, eight hundred eighty-seven".